Beach Colony resort is a nice place to stay centrally located.
I do not know how old you are but I will assume you are married and have children.
Here you go for lots to do.
Broadway on the beach lots of shops and miniature golf as well.
Myrtle Beach Speedway
If you are willing to travel south for lunch, between Surfside and Garden City overlooking the ocean is the Conch Cafe. Moderately priced good food and a full service bar. Our favorite lunch spot. We usually go twice during the week.
There is also a Hard Rock Cafe and a Nascar Cafe as well right by Broadway on the beach.
Night time entertainment is out of sight. All sorts of dance clubs and two theaters with live entertainment.
Chamber of Commerce
Like to fish? The Surfside Pier is nice and inexpensive. There are also head boats that go out into the ocean that do not cost a lot.
I could go on and on but you get the picture. If you have never been to Myrtle Beach be prepared for fun in the sun.
Other Stuff to do for your week at the beach.
Just north of you is an area called restaurant row and for a good reason.