NEGATIVE EFFECTS
One negative effect can be pollution such as water and air. A lot of times the tourists will litter and quite often care less of the local economy except for their own personal benefit.
Sometimes, the culture of tourists and the cutlure of the locals can be in conflict and even riots have been known to break out. A perfect example of this are the riots that have broken out at a few different Caribbean Islands. The underlying cause of this has been the lack of communication between locals and tourists.