Second what chevy says regarding Hershey park. It also joins up with George Bush park for a pretty nice route, and there's really no need to go onto the streets at all, if you don't mind turning back and riding back the same way you came. The Memorial Park routes are quite good, too, and they're closer to where you're staying. Depending on exactly where you are, you might want to drive into the park with your bike on a rack, park and go from there. Auto traffic in the 610-Memorial area can be pretty hairy around 6:00 pm.
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Kicked out of the Webelos.