For many years, I've enjoyed inflatables--not just dolls, though I like those, but also inflatable pool toys like beach balls, air mattresses, swim rings, and animal ride-ons. Basically, anything you can fill full of air and take for a ride is fair game! It can take awhile to figure out which toys are best for you, depending on your body style, and what positions you like best, but pumping inflatables can be a great way to get yourself off.
Best of all, this can work for women too. My wife occasionally blows up and straddles my inflatable orca, and she says when she rubs it right, it's VERY stimulating.
Of course, it doesn't hurt that I like watching her inflate my toys. I also enjoy puncture-play--where someone threatens to punch a hole in a toy while I'm riding it (and sometimes does).