SCUBA DIVING
Anyone who knows diving knows that diving in Cancun is sublime. Whether your clients are adventurous spirits with no diving experience or certified divers looking for a new Underwater thrill, Cancun has enough of a variety to please everyone. A one-tank dive costs around US$45, a two-tank dive, around US$55-$60. Many of the dive shops also offer a four-hour resort course for around US$70. To become certified in Cancun takes from four to five days and costs about US$350. The average dive in Cancun is around 35 feet, but open-water dives can go as deep as 50 to 60 feet. Drift diving is the norm here, and the big attractions are the coral reefs, near which it is possible to see hundreds of fish.

DEEP-SEA FISHING
Marinas offer private and group charters for four,, six- or eight-hour trips, and usually include equipment, bait, licenses, lunch and all the beer and soft drinks you can handle. From February to April, fishermen can expect king fish, barracuda, small shark, grouper and blue marlin. From September to February: barracuda, grouper, snapper, mackerel and arnberjack. From April to August: blue marlin, sail fish, tuna, bonito and mahi-mahi.

JUNGLE TOURS
Many of the marinas in Cancun are now offering an eco-adventure through the Nichupte Lagoon they have dubbed the jungle tour. Manning your own two-person vehicles, you may take a guided tour through the dense ma1lgrove forest to a section of one of the largest coral reefs in the world. Here you can snorkel, sunbathe and relax before returning to the marina. The jungle tour is about US$35.

OTHER ROUTES TO THE REEF
In addition to the jungle tour, AquaWorld, Cancun's biggest marina, offers what they call the Paradise Island Adventure, different from the former only in that you are taken on a boat out to the reef, where you can spend a few hours or a whole day on a tiny island, with lunch, soft drinks and alcoholic beverages at your disposal. Boats return every hour to the marina.Other excursions to the reefs are in glass-bottom boats, where the fish and coral can be eyed without ever getting wet. Jet skis and waverunners can be rented at most marinas for self-guided excursions on the lagoon. Waterskiing is also popular on the lagoon, and can cost as little as US$1 per minute. Several marinas will provide boats for private charter that can accommodate anywhere from two to 200 passengers.

PARASAILNG
Sailing high above the aquamarine seas with a bird’s eye view of Cancun is a thrilling adventure and very popular activity at Cancun’s beaches. The sailor is strapped into a vest attached to a colorful parachute and pulled by a speedboat high above the water. Some marinas have two-seaters, for an extra boost of moral support!

SUBMARINE TRIPS
Yet another kind of underwater adventure Cancun can provide is one where you never have to get wet. Semi-submarines and submarines have below-deck compartments for viewing marine life, plus narration to make sure you know what you are seeing. AquaWorld’s "SubSee Explorer" is docked at their man-made island, and is part of their Paradise Island Adventure (US$45). Atlantis Submarine is the real thing - a fully immersed sub - that takes 48 passengers on a 45-minute tour.