Moorea is very easy to drive around....it's impossible to get lost. Make sure you drive up to the Belvedere where you can see both Opunahu and Cook's Bay. There's an agricultural school on the way up the mountain where you can stop for homemade jams and ice cream. Good reasonably priced lunch place is Les Tipaniers. Lovely beach and nice outlook. The Hilton offers the best snorkeling in a terrific setting but I think they charge a day use fee. I believe the fee includes lunch and use of SUPs and kayaks.
Huahine is so laid back and authenticly Polynesian. Very little tourism there which is part of the reason we love it. You'll find friendly local folks at the tender dock offering tours if you haven't pre-booked one. Our favorite is Manava. If you're into snorkeling and shark/ray feeding as well as an island tour, Huahine Nautique has a website where you can book their excursion with lunch on a motu which is good fun with great food!
If you're wanting a local experience on Raiatea, the snack at the pier has the best chow mein for a reasonable price and cold Hinanos! The local market is adjacent to the pier.
Any other questions, just ask.