Well, you gotta try the pimento cheese sandwich. That's just tradition. :)
Souveniers and stuff you can buy at the shops on the course are not overly expensive.
When I went last, people asked me to bring them back things and before it was all said and done I had spent almost $500.
To get a feel, you really need to walk the entire course before you decide to find a place to just sit and watch. It is well worth it to get to see the entire golf course, grounds, area...