Do you need to reserve? If yes, for how long can we stay? Thank you.

We bring out own gear to snorkel and have never needed a reservation I would say call if you plan to scuba dive, but generally if they're busy you get like 2-3 hours in the spring and you can walk the grounds. They're is also a pool

We got there at 10:00 on a weekday. There were not alot of people there so it was perfect. May want to wear a wet suit. The water is 72 degrees. A little cool .

Never had a wait while diving. There have been waits for snorkelers many times I've been there though

Theres a check in process to snorkel and if its packed your put on a waiting list and groups are sent down every 2 hours. You can go in and out of the den for those 2 hours. Scuba Divers check in earlier and get priority.

But get there early if you snorkel. They cut off snorkelrs after a certain limit. I've seen the cut off time be 10:30am on the weekends

You don't need reservations if you snorkel