I want to put in my vote for Twistee Treat LBV as a worthy trip offsite. The ice cream (really a soft-serve, custard kind of thing) is very good, the service is excellent, and the prices can't be beat. We stayed onsite (OKW), but I regret to say we visited Twistee Treat LBV virtually every day. I wish I had the cash to open a franchise back home. 
