Holiday shopping for the adventure-loving people on your list is tough. Many either already have all the outdoor gear they need or are too particular to let anyone else shop for things like skis or running shoes. Instead of one more pair of wool hiking socks or yet another headlamp, how about giving an outdoor experience? Nowadays, you can find gift cards for things like cool guided trips, credit toward campsites and off-the-beaten-path vacation housing, or a chance to learn a new skill.