Definately stay away from RV parks, they charge you about $17-$20 a night...
Where I live on the gulf coast side of Fl there are several State parks and county parks where the cost is only $5 a night, they usually have free firewood and very clean showers and restrooms. There is one near me called Starkey Park and its in city limits so you would be close to convenience stores and what not...
Good luck and ride safe