Can i camp for more than 1 night? and how much will it cost?

Yes you can camp more than one night.

Camping fee is $20 per night plus tax. Reservation is made online at www.reserveamerica.com . A $6.70 reservation fee is charged.

Yeah, you can. From their site: "on-refundable $6.70 reservation fee. Includes water and electricity. Florida residents who are 65 years of age or older or who hold a social security disability award certificate or a 100 percent disability award certificate from the Federal Government are permitted to receive a 50 percent discount on current base campsite fees. Proof of eligibility required. $5 per person, per night: primitive camping. $1 per youth, per night: youth camping. $5 per adult/chaperone, per night: youth camping."