As with most of the areas we attempt to summarise, Canyonlands has unlimited possibilites. Trying to present all of the possibilities here would take a website in itself. There are untold guides- in print and online, as well as guides services- to help you discover the park. What we will try to do is outline what you can do in the park, and give a few recommended guidebooks and guide services for further, more indepth information.
The first place to look to understand more about the park is the National Park Service website. The website has all the information you need to plan your trip, including downloadable maps, campground locations and sizes, fee schedules, contact phone numbers, and downloadable permit application. Visit the site and plan well in advance for river trips and White Rim trips especially in the spring and fall, as dates tend to fill quickly.
In summary, in Canyonlands you can: camp, hike, backpack, bike, four wheel, ride horseback, rock climb, and float. Some of the more poplular reasons for visiting the park, besides simply driving through and taking a look, include floating on the Green and Colorado rivers, biking and driving the White Rim Road, and backpacking in the Maze District.