+1 for Hawaii.. We've been to Maui for 4 weeks the past 2 years and going back this year as well. I'm with Greg on the gay feeling you get while snorkling or SCUBA diving. I swam by giant sea turtles that were over 6 ft long, got to hold an octopus, and just the things you see underwater are amazing. The only bad thing about Maui is the price, everything is EXPENSIVE. Pretty sure that Kauai is up there in cost as well.. hell, about everything in Hawaii is expensive. Plus, in Maui there isn't much nightlife and with a 6 hour time change, you feel like going to bed by 10pm every night anyways. (if you do choose Maui, PM me and I'll let you know what and what not to do)
You might want to consider Punta Cana too, My friend and his wife just got back from a week at the Bavaro Princess and loved it. Had a direct flight from Cincy and the cost wasn't all that bad (around 1,000-1,200 each), and this was an all inclusive resort. Do a search on ebay for punta cana and there is an auction there for 4 days at the Secrets Punta Cana for 1,079.. This place is usually around 400-500 a night so this is a decent deal (flight not included).
Try tripadvisor.com and do a search for the area you want to go, they have traveler ratings from the best to worst hotels and hundreds of reviews plus candid photos of the resort that the travelers take and post.. Not dolled up pics the resorts hand out.