My son loves the once a month parents' night out event. For $15 he has dinner, plays with all the exhibits and learns about something related to farming. Every session has a theme. We drop off at 6 and pick up at 9. It is a great value and my seven year old son loves it.
There isn't really much to do to be honest. We went and looked around for a bit, but paying to visit that place isn't worth the month. Frying Pan Farm is much better if you're looking for a fun farm atmosphere.