That would be Copa Cabana, great place to eat. They have belly dancers tooKeg in Niagara is average. Go to the all you can eat brazillian steak house across from the casino. Nice patio too.
Sundowner is the only place to go in Niagara adult entertainment wise.
If you check on BP some of the girls there do stags, as well the agencies usually have a few as well. Make sure you book ahead of time and tell them for a stag if you want that.