the last pictures is a common sight but to be honest it is a bit of fakenews because those bottles were going to be collected. Plastic waste is a massive problem in Thailand though, and it is just frustrating to see that the park rangers normally end up burning it rather than taking care of it properly. Would it be awesome if no one brought the plastic there in the first place? Of course. But it is extra frustrating to me that the tourists pay an admission charge that is supposed to go towards proper clean up but alas, it is not.