Pretty wide open question. We don't know your interests, whether you like to hike or fish, visit scenic or historic locations. Even without a specific time or place, you'll get a lot better answers with more info.
Some things to consider:
Many places in the central and eastern parts of the US get pretty hot and humid in the summer. OK to sightsee from the comfort of a vehicle, but can be stiffling to get out and walk around much. Spring means blossoms, fall means trees changing.
June through August is very busy as schools are out and families are travelling.
When looking for places to stay, don't forget to look into state parks, Corp of Engineer parks, and National Forest CG's. Compared to the west, many more of these parks have partial or even FHU and typically have more scenic settings and more space between sites than private CG's.
Here is a list of the state park websites I put together a few years ago.
Check out the
National Park Service website. Look at each state you might want to visit. Of course the big NP's are listed, but there are many smaller, quieter parks and monuments that can be every bit and scenic and interesting.
Some highlights we really like:
Big Bend NP in west Texas in Feb and March.
Carlsbad Caverns, NM
The Ouachita Mountains of Ark.
Take in a parts of the Great River Road along the Mississippi. Different look and society depending on where you are along it.
The Blue Ridge Parkway from Great Smoky Mountains NP all the way up to Shenandoah NP's. Of course if you take that, you miss the interest drive up along the coast through places like Charleston, Savannah, and the Outer Banks of NC.
Washington DC. I know you are from Canada, but there's so much to see and do there that is beyond just US history. Art museums, the Air and Space Museum, etc. One can spend weeks exploring. We spent six days last time we went.
Acadia NP in Maine is well worth the trip.
Fall colors in the NE. Vermont and NH have lots of backroads through their mountains.
There are great museums all across the country. The Greenfield Museum near Detroit is interesting. Colonial Williamsburg is a historical town preserved and recreated. Even small places like Minden NE has a great little museum in the Pioneer Village.
Give us more info on your likes and we'll give you more ideas.
