Question: What popular kayaking spot is located in the capital and second largest city of the U.S. state of South Carolina?

Context paragraphs:
U.S. Route 378: U.S. Route 378 (US 378) is a spur of US 78 in the U.S. states of Georgia and South Carolina.  The U.S. Highway runs 234.30 mi from US 78, Georgia State Route 10 (SR 10), SR 17, and SR 47 in Washington, Georgia, east to US 501 Business in Conway, South Carolina.  US 378 connects the Central Savannah River Area in both states with the Midlands and Pee Dee regions of South Carolina.  The U.S. Highway's western portion, which connects Washington and Lincolnton in Georgia and McCormick, Saluda, and Lexington in South Carolina, is mainly a rural highway.  US 378 is a major suburban and urban highway through Lexington and the South Carolina state capital, Columbia.  The highway has a lengthy concurrency with US 76 between Columbia and Sumter and serves as a major route between the Midlands and the Myrtle Beach area, between which the highway has a business route through Lake City.

Columbia, South Carolina: Columbia is the capital and second largest city of the U.S. state of South Carolina, with a population estimate of 134,309 as of 2016.  The city serves as the county seat of Richland County, and a portion of the city extends into neighboring Lexington County.  It is the center of the Columbia metropolitan statistical area, which had a population of 767,598 as of the 2010 United States Census, growing to 817,488 by July 1, 2016, according to 2015 U.S. Census estimates.  The name "Columbia" is a poetic term used for the United States, originating from the name of Christopher Columbus.

Millrace Rapids: Millrace Rapids is a popular kayaking playspot, located on the Lower Saluda River in Columbia, South Carolina.

South Carolina Highway Patrol: The South Carolina Highway Patrol is the highway patrol agency for South Carolina, which has jurisdiction anywhere in the state except for federal or military installations.  The Highway Patrol was created in 1930 and is an organization with a rank structure similar to the armed forces.  The mission of the South Carolina Highway Patrol includes enforcing the rules and regulations in order to ensure road way safety and reducing crime as outlined by South Carolina law.  The Highway Patrol is the largest division of the South Carolina Department of Public Safety and its headquarters is located in Blythewood.  This department also includes the South Carolina State Transport Police Division, and the South Carolina Bureau of Protective Services.

U.S. Route 176: U.S. Route 176 (US 176) is a spur of US 76 in the U.S. states of North Carolina and South Carolina.  The U.S. Highway runs 237.98 mi from US 25 Business and North Carolina Highway 225 (NC 225) in Hendersonville, North Carolina, east to US 52 in Goose Creek, South Carolina.  US 176 serves the transition region between the Blue Ridge Mountains and Foothills of Western North Carolina and the Upstate, Midlands, and Lowcountry regions of South Carolina.  The highway passes through and connects Spartanburg, one of two major cities in the Upstate, and Columbia, the South Carolina state capital and central city of the Midlands.  US 176 parallels and serves as a secondary highway to Interstate 26 (I-26) except for between Spartanburg and Columbia, where the U.S. Highway deviates from the I-26 corridor to serve Union.

South Carolina State House: The South Carolina State House is the building housing the government of the U.S. state of South Carolina.  The building houses the South Carolina General Assembly and the offices of the Governor and Lieutenant Governor of South Carolina.  Until 1971, it also housed the Supreme Court.  It is located in the capital city of Columbia near the corner of Gervais and Assembly Streets.

Interstate 73: Interstate 73 (I-73) is an Interstate Highway, located within the U.S. state of North Carolina.  It is part of a longer planned corridor, defined by various federal laws to run from Myrtle Beach, South Carolina, to Sault Ste. Marie, Michigan, but only the part south of West Virginia is under study as of 2012.  The corridor passes through the states of South Carolina, North Carolina, Virginia, West Virginia, Ohio, and Michigan.  Ohio and Michigan do not plan to build any part of the highway, as the I-73 corridor in both of these states is already served by existing freeways or 4-lane highways that will eventually be upgraded to freeways.  West Virginia is building its section, mostly along U.S. Highway 52, as a four-lane divided highway, but not meeting the Interstate Highway standards.  On the other hand, North Carolina and South Carolina have built sections and Virginia plans to build its part.  Thus Interstate 73 will, once scheduled projects are completed, run from South Carolina to Roanoke, Virginia, where it will end at Interstate 81.  Associated with these plans are those for the extension of Interstate 74 from Cincinnati to Myrtle Beach, with several highway overlaps contemplated.

South Carolina Governor's Mansion: The South Carolina Governor's Mansion (or the South Carolina Executive Mansion) is a historic U.S. governor's mansion in the Arsenal Hill neighborhood of Columbia, South Carolina and the official residence of the Governor of South Carolina.  It is a Federal style home influenced by British Colonial plantations.  The building has a white stucco exterior and originally served as faculty quarters for the Arsenal Academy which together with the Citadel Academy in Charleston formed The South Carolina Military Academy (now The Citadel).  The Arsenal was burned along with the city of Columbia by Sherman's forces in February, 1865; the structure was the only surviving building and became South Carolina's executive mansion in 1868 On June 5, 1970, the building was registered with the U.S. National Register of Historic Places.  The mansion is located on a single city block, and is surrounded by magnolia plants, elm and oak trees, and various other plants.  It is accessed by a circular driveway around a fountain in front on the residence's main entrance.  Scott Bolser oversees maintenance of the historic grounds at the mansion.  The building has a flat roof and a large central pavilion around the main entrance.  The mansion has 15 rooms (excluding powder rooms, security and staff offices, and the kitchen).  It is located in Columbia Historic District I.

Greenville, South Carolina: Greenville ( ; locally ) is the largest city and the county seat of Greenville County in the Upstate region of South Carolina, in the United States.  The city's mayor is Knox White, who has served in that position since December 1995.  With an estimated population of 67,453 as of 2016, it is the sixth-largest city in the state.  The population of the surrounding area was 400,492 as of 2010, making it the third-largest urban area in South Carolina as well as the fastest growing.  Greenville is the largest city in the Greenville-Anderson-Mauldin Metropolitan Statistical Area.  The MSA had a population of 884,975 in 2016, making it the largest in South Carolina and the third largest in The Carolinas.

Santee River: The Santee River is a river in South Carolina in the United States, 143 mi long.  The Santee and its tributaries provide the principal drainage for the coastal areas of southeastern South Carolina and navigation for the central coastal plain of South Carolina, emptying into the Atlantic Ocean approximately 440 mi from its farthest headwater on the Catawba River in North Carolina.  The Santee River is the second largest river on the eastern coast of the United States, second only to the Susquehanna River in drainage area and flow.  Much of the upper river is impounded by the expansive, horn-shaped Lake Marion reservoir, formed by the 8 mi -long Santee Dam.  It was built during the Great Depression of the 1930s as a Works Progress Administration (WPA) project to provide a major source of hydroelectric power for the state of South Carolina.

Supporting paragraphs: Millrace Rapids Columbia, South Carolina
Answer: Millrace Rapids