There are several addresses for Delanco Camp, which one you'll want to use depends on what you're writing for.
Camp Registrations
Delanco Camp Registrar
PO Box 303
Oceanville, NJ 08231
Contributions
Delanco Camp Financial Secretary
P.O. Box 597
Sicklerville, NJ 08081
Anyone actually at Delanco Camp
Name of Recipient
c/o Delanco Camp
171 Sooy Place Road
Tabernacle, NJ 08088