This is the caption along with the pic I found:
Rare Kristen Stewart Pic.
We went to Costa Rica a couple of years ago and had the chance to hang out with Kristen Stewart who put on a cute and tiny bikini for a day in paradise. On the boat, one of our tour guides had eyes only for her, he asked for an autograph that she gladly gave him and he offered her to teach her Spanish. We enjoy a lunch in Isla Tortugas, bought a few souvenirs and enjoyed the sunny day. We ended up getting too much sun at the end of the day, but enjoyed swimming and snorkeling together. It's not every day that you get to vacation with a celebrity!
Where I found this