Gotta watch the Windsurfers at Ho'okipa. Also, if you are going to do the Hale'akala bike trip, don't do the guided one from the top. If you do that one, you have to stay together as a group. Mo bettah to take the one that drops you off at the bottom of the national park. I've done that one and they still take you up to the top, give you a good tour, and then take you back to about the 8000 ft level where they set you free. There's a great place for brunch about halfway down but the name escapes me. I like the Charthouse in Lahaina for a nice dinner. If you like to fish, you are in the right place. Grab 5 of your buddies and charter a boat and go catching (that's right, catching). Lot's of good fishing and you may even hook up with a Pacific Blue Marlin. Conditions look right for you to be able to catch some good surf on the south facing beaches for the first few days you are there. Have fun but be careful around the ocean. It's been a bad year for drownings. Swim only at guarded beaches, heed the signs and listen to the lifeguards and you'll be fine. Aloha.
PS. Please spend a lot of money