WE are doing both. We booked at the paradisus the snorkeling sunset excursions from scuba carribean - it was cheap and drinks included for 500.00 for 20 people (2hurs)
Then we booked atv for another day- again got a great deal -
Our bags are good but not great- I think..We have sunblock, pool raft, starfish soap, starfish wine topper, maps of the island & rersort, spanish for dummies, cards, chapstick, and some other stff