Just got back last night, see my posts in the general Harley forum. Rat Hole, Spokes, Hooters, Suck Bang Blow and Murrels Inlet HD vendors all get a big vote from me.
If you want to avoid the traffic and just hit the vendors, you can take Hwy 22 to North Myrtle. It will end at Hwy. 17N. Take a left and you will end up near the Bass Pro Shop. There are quite a few vendors there. Then you can head South and hit the rest of the rally and vendors straight down 17
We just got back Monday. All the usual places are still good. But we found one we had not been before that is worth a visit. We were driving down beach ave and heard some good music and found Macadoos on 3rd st south right on the beach. Small place cold beer and great music from 2-6 and 8-12. No vendors but nice place to sit and have a beer relax and listen to nice music.