Here are a few new ways to get a natural buzz. Strapped into a harness and latched to a cable, active types can zip along 525-foot-high lines on canopy expeditions with Sky Trek (Monteverde; 011-506/645-5238; $40). It's a thrilling way to see the treetops. The perilous sport of waterfall rappelling also requires a harnessfor sliding down ropes hung from the crest of a waterfall. Try it at El Remanso Hotel (www.elremanso.com; tours from $75 per person), on the Osa Peninsula. For a look beneath the earth's crust, Sunset Tours (011-506/479-9415; www.sunsettourscr.com; $25) runs trips into the newly discovered Venado Caverns near La Fortuna.
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