Side note FWIW: I've never in my life heard of anyone flying into Myrtle Beach.
The availability of flights isn’t always convenient, but super easy airport to get in and out of and low prices typically. I can fly round trip from Wilmington, DE to MB for $100-150 a person.
Best flight I’ve ever been on was actually from Allentown, PA to Myrtle years ago. Leather seats, plenty of leg room, full meal, in flight trivia with prizes, for less than $100/person. The airline? Hooters airline with in-flight Hooters girls. True story.
Depending on where you end up staying, I really liked Parson’s Table in Little River (just north of North Myrtle). Steak and seafood place with great ambiance.
If you get up into North Carolina, there’s a small place called Sugar Shack in Ocean Isle that has amazing Caribbean food. Can be tough to get into though. Calabash Creamery isn’t that far away and has fantastic ice cream, though again, lines can be out the door.
If you’re looking for a really chill beach to hang out on, Sunset Beach, NC is really low key. Parking can be a bit tough, but you can find wide open spots to setup on and enjoy with the hordes of people.