For those who like to move fast on the waters, jet skis are just the thing. You can solo on a jet ski or double up on a Wave Runner. Both require a minimum amount of time to learn and are safe for most adults. Several marinas offer jungle tours that combine a trip on jet skis through the mangroves and snorkeling off the reef. Remember not to drink and Jet Ski. Prices start at $70 per hour for jet skis and $60 for Wave Runners.