Four Mile State Campground in Youngstown NY, about 10 miles north of Niagara Falls, NY. It is a very nice campground. Branches of Niagara Campground on Grand Island is very, very nice. KOA’s around here, not so nice.
Fantasy Island Amusement Park on Grand Island, Just south of Niagara Falls on I-190 It’s a small, kid friendly park with rides for the little ones.
There is plenty to do there for a week:
Old Fort Niagara, Whirlpool Jet Boat Tours, Niagara Falls State Park is right at the Falls. Many attractions on Canadian side as well, bring your passports.
Lockport NY, 14 miles east has Erie Canal Locks tours, Lockport Caves, Zip Line across the Erie Canal and Lockport Locks/Erie Canal Boat Tours.