This marks the start of the Echo Valley nature trail. For every tourist attraction, you'll see these tents. They'll check if your group has a guide. No guide, no tour. They're very strict re: that. I think that's good, because some of the trails are dangerous or far-off, and tourists might get lost if they don't have a guide. Then they'll be a problem of the local gov't bcos search parties have to be organized if someone gets lost. It can also cause bad publicity if something happens to tourists. So IMO, it's good to regulate these things. They'll also check your receipt - if you have paid the environmental fee at the tourism office.