In a recent post I spoke about the Road to Hana, which was really beautiful, but a long day. The following day Tara and I went to Haleakala Crater for Sunrise. It was frigidly cold up there for a bunch of tourists in Hawaii. They said the temperature was 44 (apparently warm) with 30-40 mile an hour winds (lighter then usual.) But the views were amazing. Overall though I really liked Maui and can see why it's the Island that most people talk about visiting. It's lush and green and has good weather. My only complaint would be that it's not the best island for cruise ship passengers since there isn't much near the port and taxi's are expensive.
If you're visiting by cruise I would suggest either doing excursions or renting a car. If you want to see Hana do an excursion, the same for Haleakala Crater at sunrise. Most other things I got the impression that a rental car is the best way to go as most of the island is drivable and there is quite a few things to do which can be covered in one day by car. But with just 2 days in port I was left with a feeling that I would like to come back one day because there is more to see there, which is a good thing. Since I'm not much of a beach person I can't really comment on the beaches, actually I didn't visit any in Maui. But there are supposed to be some of the best in the world there.
Before leaving home I had heard the bike ride down Haleakala was really good, I saw people doing this and it looked like a death sentence. It's a steep ride down on the side of a road. The type of road with cars and buses driving right along side you without a separate bike lane. Our guide told us that they are considering stopping this excursion because it is dangerous. A couple that we met on our tour to Hana did the Best of Maui excursion, they said they liked it but certainly didn't seem impressed with it.
I did find the tour guides to be really friendly and eager for everyone to learn about Hawaii, this included the shuttle drivers who take you to the shopping centers near the port. Everyone I met wanted us to enjoy our trip and love the island as much as they did.