I leave for Maui on Sunday.
Any must-sees and must-dos while I'm there from USMB members who have been there?
Any input would be appreciated.
The trip to Hana is really long and honestly, I would NEVER do it again....but if you choose to do it, make certain you leave at the crack of dawn, make certain you have an extra set of balls with you because it'll take more than one to make it there!

the cliffs and one way passage in many spots on the road with a truck heading your way and 200 feet to the bottom of the cliff on the other side...........just toooooo stressful for moi and the hubby....I can remember yelling at him to SLOW DOWN and him screaming back ''I'm only going 10mph'' and me screaming back, "then go 5mph!". We ended up driving back to the hotel on the back side of the island, with mostly dirt roads....but no major cliffs and no traffic, it was actually the best part of the trip, pot holes the size of Alaska and all....
Do a luau at one of the hotels in Lahaina on the beach.... make certain you take a cab there and not to drive your own rental car....you will be soooo drunk after the event it will NOT be safe to drive!
don't pay to go snorkeling, you can do it right off the beach...most any lagoon and it is fantastic! Explore the different beaches including black sand beaches...pack a lunch and a straw mat that rolls up that they sell there to lay down on at the different beaches and get in your convertible rental car and just take off driving along the coast and stop at different beaches.
Take the helicopter ride at your own risk over Haleakala....we kissed the ground and praised God that we were alive, when that ride was over!

Maybe do the sunrise tour of Haleakala.... or bike ride tour.
Take advantage of your hotel's happy hour/free drinks.
Do a dinner on the beach at sunset!
It's an "early to rise" vacation and you are pooped and asleep by 10 pm, to rise the next morning a 6am....in search of another fabulous beach to snorkel at! We brought our snorkeling gear, but you can rent it fairly easily...so no need to fly with it like we did...