Billybob:
We did the stingray ballet in Bora Bora through the ship and the lagoon discovery with snorkeling on Moorea through the ship also. We didn't rent a car or dune buggy on Moorea but if you want to see the jungle, etc. and other areas inland besides what's at the dock area that is a good option. Some people we met did that and said it was a good way to look around. They rented at the dock for 4 hours. The tour desk has discount coupons for Avis. They are helpful about what to see if you do rent a car. We didn't do any land like things on Bora Bora as we wanted to spend time at the BB Motu which was beautiful and had booked the waverunners one a.m. and the snorkel the other. You could snorkel off the beach at the Motu. Both Bora Bora and Moorea have "tents" with shopping right at the dock. Actually what they had at Moorea was a bit nicer. We weren't interested in doing much shopping or land touring as we wanted to focus on the water!
Let me know if you have any other questions. Are you going on the 7 or 10 day? If on the 10 day I would avoid the ship's Rangiroa snorkeling trip...the aquarium was great where you snorkeled but the "tour operator" was basically just a kid driving a water taxi! That was the only negative we had for our entire trip. Even the coffee and fruit which someone had previously had issues with were definitely good to our taste or improved.

Wish I were going again! Will have to plan it.
Carol