Wachesaw is a really nice community, but certainly not the only one! If you had a chance to travel down to Pawleys Island, there are many really nice residential communities also. Some gated, some not... several have golf courses/clubs.
Areas of Garden City & surfside are nice too but then you are getting closer to the Myrtle Beach crowd. In Murrells you really only have to deal with summer crowds along Business 17 where the restaurants are. Obviously, there will be increased traffic along Hwy 17 but never gets really congested... except during the May & October biker weeks.
Here is a link for the
Bike The Neck that can give you some ideas about the bike trails. The one in Huntington Beach State Park is new within the past year and pretty nice and they are scheduled to do road improvements along Kings River Road to expand a bike lane. The plan is to have a continual bike path all the way down to Charleston... who knows how long that will take!
Beach access at the state park is very nice and usually doesn't get too crowded. You can get a Georgetown Co. residents annual pass at the county's parks & recreation center ( Ithink it was $35) well worth it. We also bought an annual pass to Brookgreen Gardens. There are 6 small parking areas on Pawleys Island and the county lot on the south end for beach access there. There are some public accesses in Garden City, too.
Temperatures made their way to about 71 today and we went for along walk along the beach, it was absolutely gorgeous especially after the cold week.