There are tons of cool ways to propose. You don’t have to do the traditional spiel if that’s just not your style. Take a cue from these ideas and find the cool ways to propose that will rock his or her world!
In An Alternate Reality Game (ARG)
An ARG is, according to wikipedia, "is an interactive narrative that uses the real world as a platform, often involving multiple media and game elements, to tell a story that may be affected by participants' ideas or actions." Go nuts with this one; get your friends, family, and even actors to craft an alternate-reality game where your girlfriend must find and save you so you can propose to her (or whatever story you'd like!)
On a Motorcycle
Well, if you're looking for cool... invite your girl out somewhere, but be just out of sight when she shows up. Wearing your best leather jacket, jeans, and Aviators, roll up on your motorcycle, park it, and ask her to marry you! Bonus points: Ride off into the sunset with her on the motorcycle! Cool ways to propose don’t get much better than a motorcycle and leather jacket!
Spelunking is the practice of exploring caves; perfect for the adventurous couple! Some of these caverns have breathtaking natural formations, formed of crystals, stalactites, and more. Find one of those gorgeous rooms that has light reflecting off the natural, smooth surface and you've got yourself a winning place to propose!
Nothing gets the blood pumping like hurtling at terminal velocity to the ground. If the two of you are adrenaline junkies, she'll get an extra kick out of seeing that ring in the air! Remember, though, you can't propose verbally; try a sign on your clothes / helmet, or a huge sign on the ground you can point to. Also attach the ring securely to your person (You don't want that flying out to Neverland).
At a Wine-Tasting
Cool ways to propose can take a cue from tradition. Wine-tastings are the cream of the crop as far as fine dining goes. For a great twist, go to a trendy wine-tasting and kind of frown a bit. When she asks what's wrong, tell her there's some sort of crystalline flavor to the wine. Proceed to pull the ring out of your mouth and propose to her right then and there!
On the Stage Of Her Favorite Movie
Did she love Lord of the Rings? Visit New Zealand, where the two of you can poke around the hobbit holes where Peter Jackson filmed the movie! Whatever movie she's into, many of them were filmed in public areas. Get to the area from her favorite movie and propose to her there!
In A Shipwreck
Are the two of you the type to go diving? Proposing under plain old water too lame for you? Go off the coast and find a shipwreck (after obtaining your PADI wreck diving specialty card, of course). While you're plumbing its depths, bring up a laminated card with your question on it and pop the question right there in the deep (being careful, of course, not to lose your ring to an enterprising fish or octopus)!
Secret Agent Zipline
If you really want to wow her, consider this trick! Set up a zipline at a predetermined spot, and ask her to meet you there. Make sure the zipline's not too obvious, and when she's looking around for you zipline down the wire, drop down, and pop your question (For bonus points, do a flourish as you jump off!)
Propose while rock-climbing! If you're really organized and know the route well, hide the ring in a crevice. As you get closer to the hold with the ring in it, complain that someone stuck something inside of it. Pull out the ring and dangle on your cord (having explained to the person belaying you what you were going to do beforehand, of course) and propose to her up on the air on the cliffside!
Laser Marry Me
For a fun proposal, consider proposing in a game of laser tag! Arrange a laser tag meeting for just the two of you, and let her win (or just lose, if she's better than you). Once she gets that final shot off at you, fall down on your knees in surrender; as you raise your hands, reveal the ring that you palmed out of your pocket!