tourism comes at a cost and it sometimes has negative impact on the enviroment or on the population.I think the main problem is that in order to make money from tourists,The local governments build roads and facilities that will change the place forever,Places of natural beauty or old towns will never be the same once thousands of tourists start visiting them day after day,I went to jiuzhaigou,a famous national park in sichuan peovince,and out the gate they have built hundreds of very ugly hotels.When you get there,you really dont want to stay,There are concrete buildings everywhere.It is noisy,and you dont feel in the heart of the mountain at all.It looks like a little city.