This is such a great place, particularly if you love fruit. My wife and I went on a day trip from Bangkok - about 2 1/2 hours each way in a rented car. (Car was 3000 THB from our hotel.)
It's just a gigantic celebration of fruit. You pay 450THB as a foreigner to get in, and that gets you a tram ride around the orchard and an all-you-can eat fruit buffet, as well as a similar custom-made green papaya salad buffet.
The fruit buffet is a dream. You just walk up to the tables, and they have mangosteens, pineapple, papaya, pomelo, snake fruit, rambutans, lanzones, mango that you just take and eat. There's a separate Durian buffet. There's also santols that fall off the trees that you can just pick up and eat - not sure why they didn't serve them. There's picnic benches around where you can sit down, and faucets where you can wash your hands. We were there at the end of May - I assume there's different fruits based on the season.
As a foreigner, one small issue is that the tram guide speaks only Thai - and a little Chinese, I think. So we didn't understand any of the commentary as we were riding through the orchard. Also, having been to other botanical gardens, I was a little disappointed the tram didn't stop anywhere so we could get out and see the trees and fruit up close. It just charged through the whole orchard with no stops.
With this in mind, my wife and I wandered off from the buffet point into the gardens. Not sure if we were supposed to do this, but no one stopped us and it was a highlight of the visit. We got to pick fresh lanzones and mangosteens off the trees and eat them. Really unique, awesome experience. We almost got lost among the trees, but managed to find our way back eventually.
You can eat as much as you want at the buffet, but they also sell the fruit pretty cheap at the visitor center, if you want to take some home. There's also fruit candies and drinks and other stuff you can buy.
Though it's not the easiest place to visit from Bangkok (much easier from Pattaya, I guess), it's worth it.
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