Was flying all day yesterday - got back from America last night and I am dragging today - thought I came down with a cold over the weekend, but it was allergies. I guess I'm allergic to Kansas.
When I vacation on Maui, we rent a small condo in Hana and bring several coolers and just relax on Hamoa Beach. I suggest 2 nights in Hana - one minimum. If you just go for the day the drive out and back will work you, especially if you are staying on the westside (Lahaina/ Kaanapali). If you are prone to getting car sick, skip Hana. Hana is "crowded" mid-day, morning and evenings you can really enjoy it.
The Haleakala crater summit is 10,000' above sea level. Hiking up there is not for the novice hiker. There are some trails a little lower down "Polipoli" - it was hit by a forest file a few years ago but has begun to recover. If you are into guided tours these folks have been around for a while, but I don't know them.
http://www.hikemaui.com/If you like horses, you can do that. A few zip lines are here as well selling the "eco" angle. Not sure how driving tourists off road in SUV's to zip line areas is "eco", but that is the cynic in me.
Good idea to cook your own food - meals here are typically overpriced and under quality from what I have experienced in the big urban areas on the mainland. If you have a unit with a small kitchen area and save dining out for a few select occasions that is how we like to travel too.
PM me and I will give you my phone number and see what you are after and make suggestions.
The current administration has cracked down on "illegal" B&B's - so there is much less selection than just 2 years ago. Visitor numbers are beginning to recover from the tank last year, but condo prices are still lower than before - if you look around. Offseason (spring and fall) you can get great prices on airfare (we flew to Portland $300 each roundtrip early last month). Christmas and summer are busy and more expensive.
Summer time the waves come in from the southeast, so snorkling in the big wave winter spots is fun (Honolua Bay).
I'll give you some friends at Maui Brewing to talk to if you want to see them.