National Parks
Tours
Adventure Trips
Many trip organizers specialize in only one type of activity; however, a few companies guide different kinds of active trips. (In some cases, these larger companies also act essentially as a clearinghouse or agent for smaller trip outfitters.) Be sure to sign on with a reliable outfitter; getting stuck with a shoddy operator can be disappointing, uncomfortable, and even dangerous. Some sports—white-water rafting and mountaineering, for example—have organizations that license or certify guides, and you should be sure that the guide you're with is properly accredited.
Contacts
Senior Tours
Those in their golden years can participate in special tours. Some of them are quite adventurous, such as Elderhostel's grandparent-grandchild river rafting cruise down Grand Canyon's Colorado River.
Single-Park Tours
If you want to concentrate solely on one park, contact the park directly to learn about organized tours they may have.