Sharks are so bad-ass: they've been around since the dinosaurs, they're highly tuned killing machines, and they're willing to risk their long-term health to play one more game for Al Pacino, on a team super-creatively also named the Sharks. For a dive trip that puts you face-to-face with some of the biggest in the world, check out Deep Sub Shark Adventures.
DSSA's a week-long dive adventure exploring the waters of Roatan, Honduras, where you'll do traditional SCUBA dives, but also "go where few humans have gone before" by hopping in a custom deep-water sub that descends 2,000 feet into absolute blackness along the cliff walls of the Cayman Trench, where you'll see some of the largest predatory sharks in the world, eerie-looking 18-footers called "six gills", which's thankfully not a nickname for a half-dozen Gilbert Gottfrieds. The sub's the deepest-diving non-commercial model on the planet, custom-built to carry three peeps to 3,000 feet, with a big 30in viewing sphere, and nine smaller ones, crazy-powerful lights to illuminate the depths, three days of emergency life support (party!), and even a CD sound system -- and yes, the submarine is actually yellow, so go ahead and play the damn song. Each participant gets one five-hour dive at night (when the leviathan killers ascend from 6000ft in the trench to 2000ft to access food), and they keep the big boys around by luring them in close with deer carcasses and pig heads, which implode due to the pressure, although that's a pretty standard reaction to Billy Joel.
During the week you'll stay at the Anthony's Key Resort and take plenty of other wreck and wall dives along the hemisphere's largest barrier reef, including the wreck of the 300ft Odyssey, and a gray reef shark encounter that's cage-less -- just like Any Given Sunday, which is great, as Nic would've been horrible as Cameron Diaz.