We were just up to BG last Friday evening for Howl-O-Scream ~ lots of scary fun!
I think an annual pass would be your best bet ~ although they are re-opening at Thanksgiving for Christmas Town which is not included on any pass, it's a separate admission.
Howl-O-Scream is great ~ it runs from 6 pm to 10 pm and at that time, the rides become walk on. If there are lots of lines during the day, you can buy a Quick Queue pass (I don't know what it costs) to get into the rides quicker ~ much like a fast pass I guess. The map tells you how intense each scary area is and I am a chicken and I wasn't scared

Anyway, do the vampire, wolfman, cornfield maze thing after dark as it loses something when it's still light out.
There are lots of food choices ~ we like the BBQ place or
Das Festhous. Always lots of seating but the food is a little pricey (like any amusement park).
Some of the stands are closed for the season but there are enough open that if you want a drink or a snack, you'll be fine.
All the rides were open except the water rides (I'm assuming the log flume is closed as I didn't look at it specifically) and the Big Bad Wolf has closed down permanently
Now is a great time to see Colonial Williamsburg, too, since it's not nearly so hot. Try the Cheese Shop in Merchant's Square for a sandwich and there are loads of fast food and chain restaurants on Rte. 60 ~ along with outlets and a huge Yankee Candle store.
You'll have a blast!!!!!