This tour is more of a simple ride to Hanauma bay.
The tour starts at 6am but you really enter the parc around 7:30am. Considering that mornings can be cloudy, entering in the ocean is nice around 8:30am if you’re not a good snorkeler. But the ride back is at 11am so expect a real 2 hours only of enjoying the beach and snorkeling. It was way too short for me. But a good ride and a nice guide.
Also, any beach equipment is very expensive to rent with the organization (20$ for an umbrella for just a couple hours) and you can’t bring voluminous object so you don’t really have a choice if you want an umbrella or a chair.