If this is the tour you are talking about we did it in 2006.
ATV BEACH & JUNGLE ADVENTURE
Approximate Duration: 5 hours Level 2, Age, Weight
This wild adventure begins in Mezcalitos, located on the northeast side of the island. An approximate 10-mile scenic trail will lead you through dense jungle to a secluded beach. Soak up the sun and cool off in the turquoise waters of the Caribbean while enjoying snacks and soft drinks, served on the beach. Climb back on the ATV and head to the ruins of La Palma for an exciting glimpse of the long lost Mayan Civilization.
Note: Participants must be at least 6 years of age and maximum weight per ATV must not exceed 350 lbs. Drivers must be at least 16 years of age and bring a valid driver’s license. Due to the rough terrain, this tour is not recommended for guests with heart, respiratory, back or neck conditions/injuries. Pregnant women cannot participate. We recommend you bring a bathing suit, towel, comfortable shoes, a hat and sunglasses. The snorkeling part of this tour will be replaced if bad weather conditions occur.
I would do it again but not for the timid. Don't expect much if any instruction. They hand you a helmet and off you go. Rocky trail thru what was a jungle befoe the last hurricane. Some should have grown back by now. Half the trip on the coast road (I got the ATV up to 50 mph
You beach stop is a nice bar free snacks and good food. Imagine a tour in the states where they serve you beer before you get back on an ATV.
Some pictures -
The "jungle" waiting for an ATV chain to be repaired
The beach bar