I agree on the caddy! Local knowledge is worth at least a few strokes at St. Andrews. I've played the OC a few times - the others as well. I've never had difficulty getting on the Old Course - even in the summer - just offer to take an afternoon tee time. (Book 1 day in advance.) Prime morning slots are rare - some of these aren't even available in the lottery.

If you'd like to torture yourself, play the Jubilee. Just leave the driver in your hotel room. Very tight, lots of deep kack, and plenty of blind shots. A masochist's dream.