Funbeaches.com/forum is where you want to be for Myrtle Beach info
This just came up two weeks ago or so.
2nd Avenue Pier Restaurant is a must go place for us to eat. Where we stay, it is a mile or so walk.
Everyone talks about Pawley's Island Tavern as the place to go to eat. Our first year I was hunting for it, it is difficult to find as it is tucked back in the woods invisible to the road with only a sign with an arrow and labeled "PIT". I missed it and we ate at the place that was right on the road. Turns out, that was the best food we had (I happened to eat nothing but shrimp for the entire week.) Island Cafe and Deli it was called. We didn't eat there last summer and we're really disappointed that we didn't.
They consider the restaurants along the marsh walk in Murrell's Inlet as a tourist trap area saying they are REALLY expensive. I don't know what you are use to, but we can't walk out of a restaurant, myself, my wife, and 2 kids for under $70 around me. I don't pay more than $50 even in the "tourist trap" area and most meals cost about $40 for the four of us. Thus, I will recommend Creek Ratz in Murrell's Inlet. All of them in Murrell's Inlet are known to be excellent, Dead Dog Saloon, Drunken Jacks, Creek Ratz.
There is also Prosser's BBQ buffet that always comes up about excellent food. I don't have first hand experience as the place certainly doesn't look like a place you want to enter. I defaulted to listening to my wife when she got sight of the place and we didn't stop.
I did not like the gigantic buffets. Crabby Mike's, Captain George's, and Original Benjamin's are the most talked about of all restaurants and are the most popular. My expectation I guess was quite different than everyone elses because to me, it was just a glorified Golden Corral. The food wasn't bad, but for the price ($28 when we were there) it certainly wasn't worth it to us. I would rather have a smaller buffet with better food (again, the food wasn't bad, just not $28/person good by any stretch.) YMMV on that.
I can't tell you about activities as we don't do any. We go to hang out on the beach from morning til dinner and after dinner, we're back on the beach.
Keep an eye out for the aliens. We saw them this past June. They weren't the same lights that was from the aircraft taking off at the airport that a lot of people report. These were very large very distinct orange lights appearing in the sky out over the ocean in a very distinct and not very closely spaced pattern. We saw them on a Wednesday as we were sitting on the beach waiting for the fireworks at the pier, and saw them the following night while we were walking the beach. They are very strange.
http://www.youtube.com/watch?v=QhUB71zzkeM
http://www.educatinghumanity.com/2012/10/myrtle-beach-mystery-ufo-sightings-for.html
http://www.ufoevidence.org/Cases/CaseView.asp?section=NL
http://hotblur.com/!/News/lights-in...s-along-myrtle-beach-coast-charlotte-observer
And here's one of several discussions that has gone on at the Funbeaches forum...
http://funbeaches.com/forum/viewtopic.php?f=1&t=13572&p=92786&hilit=orange+lights#p92786