You guys are gonna love Maui!!!! Are you extending for another 5 days there or going to another Island? Maui is my favorite, followed by the "big" Island of Hawaii.
I prefer the other side of Maui (between Kaanapali and Kaapalua) since it is so close to LaHaina and we go there every day when we're in Maui. But, you are really close to a little town called "Paia" that is really awesome. Kind-of hippy, but way cool and a short street of boutiques that aren't too pricey. There is an awesome beach over on the North side where the locals surf that is awesome to see at sunset. Baldwin beach is also really nice. If you like to hike, the Iao Valley is also a great place to visit. The road to Hana is a must!!! Stop at the gas station just past Paia to purchase the tour CD - it will tell you mile markers to stop at and what to look for, otherwise you miss a lot. Unless you are going during whale season (late December to end of March), don't bother taking a whale watch tour. If you want to see the spinner dolphins, do once of the excursions to Lanai. The ones in the Zodiac boats are cool.
There is really no need to do a snorkeling trip. On the side of the island you will be on, there are plenty of little coves that offer great snorkeling right off the shore, particularly if you continue heading South once the paved road ends.
Feel free to PM me for any other details. I've been to Maui 9 times, twice to Hawaii, once to Kauaii and Ohahu.
__________________  Sissy & Angel |