I think that there are several ways that one could celebrate Leap Day. None of them involve having a girl drop to one knee and proposing to her boyfriend. Apparently that's a real thing, not just a mediocre movie that came out in a non-Leap Year. It's a little late to go with these suggestions this year, but keep them in mind when 2016 comes around.
Go bungee jumping! I mean, I've never done it, but I hear it's a pretty big adrenaline rush. Make sure your heart can take it before you attempt it. Consult your physician.
Quantum Leap marathon! Ever find yourself missing the adventures of Dr. Sam Beckett? Well, miss no more! Most episodes from this classic time travel series are available to view on Netflix. Isn't that a great way to veg out on Leap Day?
Play Hopscotch! It's good, clean, innocent fun. All you need is a sidewalk and some chalk. And something to throw into the numbered boxes. What do they use? A coin of some kind? I don't know, I've never actually played.
Enter a Double Dutch tournament! There's got to be one somewhere. And if there isn't one, organize one. You'll be the most popular kid on the block. Unless you suck at it. Then everyone will just make fun of you.
Try something new! Come one, isn't there something you've been wanting to try out but have just been afraid to do? Take the proverbial leap. What's stopping you? If it doesn't work out, pretend like Leap Day never happened. Or, just follow this mantra: Whatever happens on Leap Day isn't spoken of again for four years.