We stayed at the jelly stone on the Canada side. It was a very nice park and 5-10 min. from Niagara Falls. They are very helpful with information. The park is clean with clean bathrooms. We were 65 feet long including the trailer and had plenty of room to park the jeep in front of the Coach and trailer still hooked. Reasonable prices and decent little store at the park. The only disadvantage is it is a little tight getting through the gate. I did it with mine at 65 feet pretty easily though. It looks tighter than it is. If you make it through customs as tight as it is, you will have no problem getting in there.
I recommend the $40 package that is four different things to do at the falls. You can buy it at the RV park. They also have a shuttle that will take you there for a small fee.
Hope you have a good time, we did