Lucky daughter.
The water is warm and clear. There are thousands of cute little blacktip reef sharks, as well as a host of tropical fish. Aside from that, there isn't really a whole lot to *DO* there (in fairness, I was honeymooning, so perhaps I wasn't as focused on getting out and finding things to go). Parasailing is a nice way to see the water and islands from above.
I stayed at the Pearl resort. Perhaps some of the bigger ones have more activities. For me, the novelty of taking a boat from my hotel to meet with a taxi to take me into town wore off quickly.
If you enjoy hiking, maybe add a couple nights over on Moorea (you'll likely fly into PPT, and Moorea is the next stop), which has some of the most gorgeous views I've ever seen.
Have a great time!