If you feel like crossong the border - Marineland is pretty cool
If you don't and want some amusement time - Fantasy Island on G.I. is low key for small kids - kinda similar to Seabreeze
The Miss Buffalo boat tour is also informative and cool enough for kids.
Then - Putt-Putt on Sheridan Drive in Tonawanda with a visit to Ted's right down the street - there are some things better than garbage plates !