Hi there,
There are no National Parks in
Delaware , so your best bet it's to head to one of the State Parks which are the best places for
camping anyway.
However, be aware that
Rockford, Creek State Parks don't offer camping facility. If you're heading north, Lums Pond State Park does offer camping sites.
Another
popular Delaware camp sites found in the middle part of the state is at the G and R Recreation Area and Campground which offers pretty nice cabins.
Hope this helps
VacationBuddy