You can ride the entire length of the Centennial Trail by driving about 22 miles east of town and starting near the Washington-Idaho border, at Exit 299 off Interstate 90. From the State Visitor Information Center there, head west along the south side the river. The area on the eastern portion of the trail lacks shade and can get hot, so bring sunscreen and a towel for a dip in any one of numerous swimmin' holes along the way. For the most part it hugs the scenic Spokane River on a nearly flat, auto-free path.
Accesses are plentiful and scenery abounds.
Ride a section of trail or the whole shebang, or use it as a springboard to adventure, either on road or single-track. For something completely different, take a right off the Centennial Trail and onto Frederick Avenue just after passing the Minnehaha Rocks climbing area at mile 17. Go about three blocks to Havanna, then turn right again and quickly enter Minnehaha Park. You can drive to the park and start an off-road ride here. Both gravel road and single-track explorations can add up to 10 hilly miles for the day.