It's best to leave early in the morning. We were the only ones at the waterfall. Entrance tickets cost 45k per person. There are lots of small shops on the paved path to the left and right. They're all trying to sell something. Unfortunately, you can't buy from all the stalls. It's best to go through them quickly, even if it's a bit difficult. If you do buy something, you can test your negotiating skills here.