Upper-Middle East Coast Campgrounds?

I suspect your best bet is to contact each of your preferred states' tourism board. You can do that online or via toll free numbers generally. You'll find that most SP systems have some campgrounds with at least water/electricity hookups and less with water/electricity and sewer. You can also find local RV dealers that will set up the RV for you and at a additional fee empty your grey and black tanks plus refill the white. Of course they rent them as well. Great if your car/truck hasn't a towing system built in and you're trying out an RV experience for the first time. Since you like the Poconos and Lancaster, I'd suggest expanding your campsite search a bit and look in the Adirondack area of NYS as well; some similar landscape there. Basically, I'd just figure out how far I'd like to travel in one day's travel and then look for convenient highway systems.

Oh and finally be sure to know the reservation windows for places you want to visit. Waiting until the spring to reserve can mean you won't find a space w/ your criteria. For instance, I spend the 4th of July at a CT state park every year and booked my site for 2015 in August 2014. Currently there are no electric/ water sites left for that time frame and barely any no hookup sites. All the "upgraded" sites were booked the first 3 days the reservation period opened.

HTH and have fun.

Check out Rip Van Winkle Campground in Saugerties, NY. You're only a little ways from Woodstock, but still in the woods. This is one of our favorite campgrounds. I don't know what kind of hiking you're into, but there's plenty of places to go right from your site if you want to spend a couple hours.

Closer to home and for hiking in the Poconos, try Otter Lake Campground in East Stroudsburg, PA. This is a very nice campground, also.

Bruce

Google rv park reviews and youll find reasonable site with lots of park listings. I don't go by any one review, more of look for consistant complains (and if it would bother me.) Woodalls is another good source to find RV parks.

In PA you have lots of options, heck just for the Hershey show other then waiting to long to setup a reservation, I found about 15 good full hookup options in the area (between harrisburg and lancaster.)

You also have gettysburg, and many other areas in PA to explore. MD campgrounds are somewhat few and far between until you get past frederick, MD. I would also recommend an early or late season trip to the luray, VA area. We enjoyed our stay in spring there 2 years ago.

I don't really get to the NY border much due to travel time, but have considered looking up that way for a long weekend trip.

rvnoob wrote:
...We would prefer something quiet, but with full hookups so we don't have to "rough it" too much, not a resort full of kids. We won't use a pool or arcade or tennis courts, just looking for nice, clean parks with some good but not too difficult hiking trails and that sort of thing, and dog friendly...Any recommendations?...

In my experience, very few commercial RV parks/campgrounds have enough property to have hiking trails of any length. So, you would need to look at ones close to public lands/recreation areas. Many state and county parks have more land and thus hiking and biking trails, etc. Checkout Delaware State Parks, Maryland State Parks, New Jersey State Parks, Pennsylvania State Parks, and New York State Parks. However, these public parks may not have full hookups. Most have at least some electric sites and often have a dump station. Some have pet restrictions and some limit pets to specific campsites and areas within the parks. Corps of Engineers Lakes often have campgrounds with some electric sites and a dump station.