Please consider Aiken or the surrounding area.
We have a wonderful 2,200 acre woods with 65 miles of trails that have been donated to the people for horseback riding & hiking. My dog LOVES to go there.
You can be in the mountains in an hour or so (depending on how you drive
), and to the beach in 3.
If you are interested I answered many questions for someone in a thread called "Interested in Aiken".