As manatees can't survive in water below 60 degrees, they migrate to Kings Bay and the adjacent rivers every winter, which are an average 72 degrees all year round. So from November through March 2012, you can head to Crystal River, which is 70 miles north of Tampa, where it is the epicenter of manatee-watching, and go frolicking with these giant but affectionate creatures.
Napa Valley Wine Train: This is as much a three-hour rolling culinary adventure as a train trip. Eat in a beautifully restored Pullman dining lounge; ride past wineries and vineyards that roll to the edge of forested mountains. Enjoy a meal, or relax in the wine-tasting car and sample any of 40 local vintages.