Do you want to deal with the problems associated with stealth camping in a heavily populated area? No fire/stove, no lights on after dark, spending the entire night worried that someone is going to roust you, etc? If camping fees are as high as you say, you might have better luck (and a better night's sleep) riding into a campground in the evening and trying to find someone who would share a campsite with you if you offer to split the fee. Telling them you're a professional chef and offering to cook dinner might also help