Ive stayed there, its very nice.
There is no gambling in Brazil.
Unless this casino is something new it is across the border into Paraguay. I would not go there. The border town is a very dangerous place. No taxi or tour guide will even take you close. You have to walk, and its bandit country.

Iguassu is where Brazil meets Paraguay and Argentina. If you havnt been before, you need to get to the Argentinian side for better photographs. You should also take one of the helicopter tours.

Prepare to get warm. Temperatures there can reach 130 no problem.