The Tours4Fun blog has posted about how to visit Niagara Falls for a week and not spend much money:
Let’s say you’re on your Niagara Falls vacation for a week. The room and transportation to and from are pre-paid because you bought a Niagara Falls tour package. Meals are extra but for this summary we’ll leave those out. This is strictly about entertaining yourself.
You arrive on a Sunday and you’re scheduled to leave the following Saturday. What’s the first thing you do?
It doesn’t really account as being under $200 if you aren’t counting room, transportation, and food!