We did the Circle Island Bus Tour and enjoyed it. You don't stay on the bus - you get on and off. Similar to the Bora Bora by Le Truck but on a bus. Summer was our tour guide and she is American married to a Tahitian. She spent time telling us about the transition to living the lifestyle - eating Lagoon fish and other new adventures, needing multiple jobs to survive, living more primitively etc. Very interesting tour. If you go, she sells fresh vanilla beans far less than if you buy them in the shops.
We did the Aqua Safari - similar to the Aqua Blue and we loved it.