There IS a Parks On The Air program that has been up and running for a while. In the USA, POTA is part of the World Wide Flora and Fauna program, which is international in scope. Like NPOTA, WWFF was devised in order to get Amateur Radio ops off their duffs and into the Great Outdoors. I love their catch phrase - "Make nature your shack!"
POTA is the United States arm of WWFF and POTA encompasses not only NPOTA, but State Parks as well. So if NPOTA was difficult for you as an activator, POTA should be easier as it will include many places that were not part of POTA.
Take for instance, the Great Swamp Wildlife Refuge (KFF-0454) here in NJ. I drive through it every time I go up to HP28, Morristown National Historical Park (KFF-0746), which is part of NPOTA. Since the Refuge is administered by the US Fish and Wildlife Service, it was not part of NPOTA - but it IS part of POTA. My favorite portable operating spot, Washington Rock State Park, is also part of POTA (KFF-1635).
Activation requirements for WWFF are a bit stricter. For a valid activation, WWFF requires 44 QSOs, while NPOTA required only 10. Happily, according to my good friend Greg N4KGL, POTA also requires only 10 QSOs for a valid activation. A good day's worth of portable operations should cover you. If you're bound and determined to work towards Activator awards, then you have a good program here to fill your heart's desire.. Me? I'll just be happy to have the "excuse" to go out and put some NJ parks on the air.
I've only just registered and have not looked into all the details about how to upload logs and stuff; but I am bound and determined to put some parks in New Jersey on the air this coming Spring and Summer for the chasers that are really into this.
72 de Larry W2LJ
QRP - When you care to send the very least!