I went for a ride the other day up Doi Suthep and down the back side into Huai Tung Thao. I have done this ride a number of times from either direction as well as just spending time at the reservoir and have never been charged or even seen anyone there to collect money. This time however there was a gentleman waiting at the gate. He called me over and said there was a 20 Baht entrance fee for tourists. I told him I was not going to the reservoir and that I was just coming back from a ride and returning to Chiang Mai. He kept insisting that I pay 20 Baht to enter, because I was a tourist. I told him I was not a tourist and very politely (the whole conversation was very polite) asked him when this policy started. At this point he said 20 Baht for tourists again, and when I pushed the question, he said I could pass for free. I'm not that cheap that I am worried about 20 Baht, I was just trying to get information about the policy but I was more than happy to let him waive the fee. Has anyone else been charged at Huai Tung Thao? Have I just been really lucky all these times and not been seen or ticketed? Seems strange to be charging for admission coming out of the park.