Anonymous wrote:7 days is not very long. If you can extend your trip to 10 days to 2 weeks I'd highly recommend it. You will be extremely jet-lagged for a few days. Use that by getting up early and enjoying the day (farmers markets, sunrise on the beach, etc.). With only 7-8 days, stick with one island. Don't eat up your precious time island hopping.
Read a bit about each island in guidebooks or online to see what matches your vibe best. Oahu gets a bad rap because it's the most populous, but there are lots of great things to do (snorkel at Hanauma Bay, Pearl Harbor, Bishop Museum on a rainy day, any number of hikes, gorgeous beaches like Lanikai and Kailua, etc).
Our family's favorite is the north shore of Kauai, known as the Garden Isle. It's far less developed than the other islands (except Molokai) and the natural beauty is astounding: fantastic snorkeling, amazing beaches, challenging hikes, etc.)
We've been to Maui and didn't care for it because it seemed too developed for our taste. But millions of others love it, so it's a personal preference.
Jet lag didn't hit me till 2 days after I got there (from DC) and it was for a few hours. Maybe I got lucky, who knows.
I do agree with sticking to one island, and what someone said about the big island is pretty much dead on in terms of what to do.