T.T.
My kids are very close to your kids in age and love the pumkin patch in Argyle. They have a train that the adults and kids can ride around the property. Here is the website: http://www.pumpkinexpress.com. There are a lot of good photo opportunites and lots of activities for the kiddos. The pumpkins are a little expensive though. We found it was best to go right when they open on Sundays. Have fun!