Get a coupon book from your hotel lobby. Plan to eat dinner before 4. Stay away from the seafood buffets (they're upwards of $20-25 per head) and places at Broadway/Barefoot/etc. Tourist tax is high in Myrtle Beach, you're going to pay a chunk of your $12 on tax - be prepared. Any of the national fast-foods will be under $12 per head. A couple of the steak houses (such as Logans by the Coastal Grand Mall) will let you out under $12 depending on what you eat. Any of the Pizza places (Pizza Hut, CiCi's, et al) will group under $12 per head. Because of the tax rate, places like Golden Coral, K&W, and Ryan's will be right there at your $12. There are 1900 restaurants in this town - something for everyone at just about every budget. "Good Places to Eat" (the higher end good-eats) are going to run you near $20 per head though.