Honeymoon suggestions (within Usa)

You could hike in the Appalachians. The southern parts should be warm.

You could try Palm Springs California and then take the tram up into the mountains. You would get a combination of warmer temperatures in Palm Springs but some probable snow. There also is Joshua Tree National Park nearby. You could probably find a hotel in the city of Joshua Tree if you wanted to be near there but not camping.

I am personally looking into going to the Florida Keys for my honeymoon. It is definitely good if you are a laid back type B personality where you can do a whole lot of nothing and chill which sounds nice after a wedding. Even then, there is still fun stuff to do like fishing tours, diving tours, Key West is always fun to visit. I have been there a few times with family and each time I really enjoy it.