By Editorial Staff

updated 6:53 p.m. ET May 8, 2008

Some travelers live on the edge. Never satisfied with lazing away their vacation days on the beach, these thrill seekers look for adventure on their days off. If orbiting the Earth, bungee-jumping from a tower on the Las Vegas Strip, or getting up-close-and-personal with a gorilla sounds like your idea of a good time, you're in luck. We've found 10 extreme vacations to get your heart racing and, just in case you aren't quite ready to swim with the sharks, we've also included a similar — albeit less-adrenaline-pulsing — alternative with each of our top adventure-filled trips.

1. Drag racing
If your adrenaline pumps just watching "The Fast and the Furious", your heart will feel like it's about to come out of your chest when you experience the real thing. Street racing is illegal, but law-abiding drag-racing schools abound. Doug Foley's Drag Racing School offers several dates in Atco, New Jersey (plus a trio of options in Michigan, Pennsylvania, and Maryland); for the highest HBM (heart beats per minute), opt for the Super Comp Dragster package, a two-day program that includes safety instruction and step-by-step familiarization with your car. Then it's time to hit the track, open the throttle, and make like Mario Andretti.

Low-adrenaline alternative: Not quite ready to get behind the wheel? Get behind Andretti himself and ride with him when you sign up for a Mario Andretti Fantasy Day. Yes, autographs are included.

2. Gorilla safari
For the chance to interact with the one of the world's most-endangered species, follow in the footsteps of Dian Fossey, the anthropologist immortalized in the 1988 movie "Gorillas in the Mist". No more than 700 mountain gorillas remain, but Volcanoes National Park in Rwanda, Africa is still the best place on the earth to spot — and maybe even touch — one of these gentle herbivores. Their distinctive personalities are endearing, while the ruins of the Karisoke Research station where Fossey was murdered and buried are themselves quite moving. JK Safari runs 4-day safaris to the area that include ecolodge stays.

Low-adrenaline alternative: If you're not up to the intense safari necessary to track the mountain gorillas, a visit to Monkey Mountain in France provides primate interactions of a different kind: the 280 Barbary Macaques monkeys here roam free among visitors, but be careful, as these mischievous creatures are known to take food right out visitors' hands!

3. Heli-skiing
If you're a top-notch skier with a penchant for adrenaline, get off the trails and take to the skies by boarding a chopper and going heli-skiing, a sport that makes the trek up the mountain as exciting as the run down. Lured by the promise of untouched slopes, wilderness solitude, and challenging terrain, those who dare to get airborne access otherwise inaccessible peaks. Valdez Heli-Camps operates tours to the Chugach mountain range in Alaska; serious extremists book the four-day Sound to Summit package that tackles Chugach's 13,000-foot peak and offers accommodations on a ship (complete with heliport) anchored in the Prince William Sound.

Low-adrenaline alternative: Have a fear of flying? Consider backcountry skiing in the Colorado Rockies instead; Paragon Guides offers great off-the-trail treks in Vail.

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4. Mountain climbing
As the holy grail of mountain climbing, the legend of Mount Everest looms large in travelers' minds, and with good reason: risking passage through the "death zone" (which takes lives every year) and reaching the summit is the achievement of a lifetime. If you're an accomplished climber, Adventure Consultants offers summit expeditions from Nepal that will set you back about $60,000 and come with no guarantees of summiting.

Low-adrenaline alternative: If you've just got to see Everest but don't want to risk your life (or spend your life savings to do it), entirely doable (and more affordable) trips to base camp — complete with spectacular views — are available from KE Adventure Travel for about $2,300.

5. Sandboarding
Whether you already consider snowboarding passe or simply can't wait till winter to carve up the slopes, try strapping on your board and tackling a mountain of sand. Sandboarding is a four-season extreme sport that's recently gained in popularity with snowboarders looking for a similar rush and surreal, desert landscapes. Sure, you could try surfing the dunes at your local beach, but for the real deal, head to Cerro Blanco near the Andes mountain range in Peru to find the world's tallest sand dune. Peru Adventure Tours runs 8-hour outings (leaving at 5 a.m.) that include board and lunch.

Low-adrenaline alternative: If carving up the sand isn't your thing, explore via dune buggy in the Oregon Dunes National Recreation Area instead.

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