The experience begins before you even reach the water - the launch point for the trip is right at the base of Hoover Dam, accessible via the narrow, winding road down the mountain from Highway 93 in Boulder City. Originally built as a track for construction equipment at the beginning of the Dam project in the 1920's, this road is not open to the public except as a route to the canoe and kayak launch area. Hot springs in the area collect into pools in side canyons that are generally easy hikes from the River. One even has a hot waterfall. Camping is unrestricted in this section of the Lake Mead National Recreation Area.
Bighorn sheep are abundant in Black Canyon and the surrounding area.
If your schedule permits, try to take advantage of a Hoover Dam tour, either the day before your trip or after you get off the water, and see the new Visitor Center as well. There are several options available, and it's a wonderful tour - well worth the time and money. There is a nominal fee for the permit which is paid directly to the Bureau. It is wise to plan Black Canyon trips well in advance, because the launches for popular spring and fall weekends are taken early. Your chances are better if you either call well in advance or if you enjoy some flexibility in desired dates.