Want to feel like you're on a tropical vacation in the dead of winter? Sea Life Aquarium Minnesota can be your staycation for less than $20. Located in the Mall of America, this underwater zoo keeps things toasty year-round so its water creatures and human guests stay warm. Those who enter will make their way along a 300-foot underwater tube as thousands of fish swim by. There are many giant tanks to check out as well, and stingrays and other beasties come out at certain times of the day to be pet and fed. While this is a great snow-day time killer when you have kids, Sea Life is also teen- and grownup-friendly, as the aquarium becomes 16-and-up after 4 p.m. on Saturday and Sunday evenings. Special date-night events often pop up on the calendar as well, and if you find love, Sea Life offers underwater wedding packages (honeymoon at the nearby waterpark?).