This was a great experience for true beginners who have not scuba dived or snorkeled before to see if they enjoy it. The instructor was very helpful in getting us comfortable with the equipment. They even led a person who did not know how to swim through the water. The whole activity takes place in a small, shallow (10-15ft) lagoon. There's some sea life and coral and the visibility was okay at 8am, but not amazing.
If you have scuba dived before and are looking for something in the actual ocean, then I would look elsewhere. If you are looking to see amazing sea life up close, you could probably find better snorkeling spots elsewhere in Oahu.