Here are some ideas..
1. Be sure to take time to look at and read the plaques. The first tee, the 11th tee, 18th fairway, etc. You're playing in a cathedral.
2. Get there early and hit some balls to loosen up. Enjoy youself. Hit your shots with a smile.
3. Hit some practice putts. Merion's greens are as firm and fast as I've ever seen.
4. On the first tee, try a 3 wood, 5 wood, or whatever you like. Remember to breathe.
5. Oh yeah - enjoy the tee markers.
6. Hit enough club on #3.
7. When you get to 11 tee, read the plaque and realize the historic ground your find yourself on.
8. Ignore the bunker on 13. Just hit your normal club and you'll be fine.
9. Check out the bench around the flagstick on 14 tee. Pretty cool.
10. As you walk through the quarry on 16, take some time to think about those who have gone before you walking on the same path. Presidents, hall of famers from every sport, etc... Pretty cool
11. Check out the back tee on 18 and chuckle. That's one hellua carry from back there.
12. Be sure to have a chat with the locker room attendant. What stories you can hear!
13. Check out the replica trophies.
14. Look for Bob Jones' scorecard.
15. Look out for the attic's hitting stalls.
16. Buy a hat and shirt. They take credit cards
And Wayne is right- don't worry about your score. And don't let him fool you about his driving in our match last week (which wasn't at Merion or French Creek). He hit one out there 300. Birdied the hole too.