K.S.
Geneva on the Lake in Ohio is nice, In Terra Alta, WV there was a "ski" resort but it is nice and inexpensive in the summer with a lake, pool, kayaking, fishing.....also central PA is about 4 hours and has Hershey chocolate world (free), and you are close to Amish country--Kitchen Kettle Village is close to Lancaster and has fun things to do. It's closed SUnday though. Also, you may want to check out all the local Pittsburgh places (Children's museum, history center, science center....) Most are free for 2 and under. Hope you have a great summer