I want to add that if you are going on vacation to Thailand, PLEASE be aware that most parks are abusive and ride their animals into the ground for profit.

If you're going to go anywhere, go here. It currently stands as the coolest thing I've ever done in my life. You pay significantly more but the elephants only go for one ride per day. You get your own elephant, you get to feed it, bathe it, and take it for its daily exercise. The money goes to rescuing animals from other abusive circuses and logging camps, and buying more land for the sanctuary. They do not use the big chairs on their backs which are bad for their ergonomics, so you get to ride bareback, which is truly like riding a dinosaur. It was started several years ago but only recently began accepting tourists once the elephants were brought back to good health and trained.

Edit: Those interested in price, when I went it was less than $70USD per person for a whole day--but my uncle new one of the travel agents and it probably depends on season--also I think my fiancee and I paid for a shared elephant, but due to it being slow we each got our own. Even twice that would still be cheap for the coolest thing you'll ever do. Yes, it's a fortune by Thai standards, but this way the elephants don't have to work hauling tourists around from dawn till dusk to pay for their food--if an elephant isn't sleeping, it's eating.