We have been to Atlantis in the Bahamas. It was really nice and the food was unbelievable. We had never spent so much money on one meal for the two of us, but it was our honeymoon. (We spent close to 300 bucks for a meal, but there were several bottles of wine involved.....) The accomidations were awesome, and plenty of excursions as well. We have also been to Aventura Palace near Cancun. It was really nice as well, and it was all-inclusive. The food was not neary as good as Atlantis. As for the most relaxing experience: We have been on 3 cruises, all of them to the carribbean, and all of them great. One was on Carnival, one Norwegian, and one on Royal Carribbean. Norwegian was my favorite. They all offer pretty much the same things to do in port. It is just laid back on the cruise ships. Go to dinner, catch a comedy show, watch a play. Food is usually top notch, and nighttime entertainment is great as well. We got two of our cruises from the site listed below, but you can get great last minute deals from www.travelzoo.com, or check out your local warehouse club (BJ's, Sam's or Costco)
Send them on a cruise!! Most on the east coast leave from Miami, but there are also ports in Norfolk, VA, Charleston, SC, New Jersey.