Rome's Sight Jogging hires out guides for jogging tours--you choose from nine routes and 20 trainers(Lorenzo Pesce)
Now and then you have to do something a little crazy--like fire a machine gun, or embarrass yourself attempting alfresco tai chi. You may not be as adventurous as you once were, but any jitters are more than made up for by being able to brag about it once you get home.
Brussels: Learn tai chi in a city park. Full-day session includes picnic. Tai Chi Relaxation, 011-32/26-49-84-74, taichirelaxation.be, $97.
Cape Town: Go kloofing: Hike, jump, and swim through Suicide Gorge. Day Trippers, 011-27/21-511-4766, http://www.daytrippers.co.za/, $90.
Cincinnati: The new Purple People Bridge Climb takes folks over the Ohio River. 859/261-6837,purplepeoplebridgeclimb.com, from $60.
Las Vegas: Fire rounds from an M-16, Uzi, and more. Las Vegas Gun Range & Firearms Center, 702/386-4867, lasvegasgunrange.net, from $50.
London: Tour the Thames by speedboat. London RIB Voyages, 011-44/207-928-2350, $44.
Quebec City: Fly in an open-cockpit biplane. Aero Production, 888/871-6095, aeroproduction.com, $76 (based on two people).
Rio de Janeiro: Work out on a stationary bike planted inside a modified bus. Bus Bike, 011-55/21-24-90-22-57, busbike.com.br, from $20.
Rome: Let an Italian trainer be your guide as you jog through the city. Sight Jogging, 011-39/347-33-53-185, sightjogging.it, $85.
Stockholm: Kayak through the heart of the city. Paddling Stockholm, 011-46/87-07-81-26-89, paddlingstockholm.se, $98.
Sydney: Catch a wave during a one-hour private surfing lesson. Manly Surf School, 011-61/2-99-77-69-77, manlysurfschool.com, $80.
Vancouver: Watch the sun set and the moon rise during a full-moon kayaking excursion in the harbor. Ecomarine Ocean Kayak Centre, 888/425-2925, ecomarine.com, $48.