Arbooretum Fall festival worth it?

I was looking for a fun event to do with my 2 and 5 year old. I saw that the Arboretum is hosting a fall festival this weekend. Looks like there are a lot of activities like trick or treat trail, pumpkin decorating and a train. I was thinking of bringing a wagon since I'm not sure how far my younger son can walk. Any advice would be appreciated and if you felt like there were enough activities to justify the entrance fee?