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Melina Mara/The Washington Post

“The Jet-Skiing Grinch” sounds like a MadLib character, but he’s a key figure in this waterlogged holiday tradition. National Harbor is the best place to spot Santa on water skis, along with kneeboarding reindeer, flying elves, the aforementioned Grinch and Frosty the Snowman in a dinghy. The show starts at 1 p.m. snow or shine.