So many of the top five, at least in the U.S. are exclusive privates. That makes it hard to enjoy the experience sometimes if not a member, or playing with a member. How about this category? Top five treated well when playing unaccompanied.
I'm trying to factor course quality as well here. I'll pick:
Chicago Golf; maybe it's the small membership so when you get there, everyone wants to know who sent you. Running into Bill Shean on the first tee and hearing the hearty "welcome" with the handshake.
Cypress Point; caveat, one must be staying in the clubhouse to get this experience.
Bel Air: They don't really do unaccompanied, but the members are so keen to share they will set you up with another member and they treat everyone on property great. (I picked this one as a contrast to LACC)
Rock Creek Cattle: I've done it both ways. I can't say I noticed any difference in how I was treated between the two.
Brambles: What a great crew up there. Felt Like a member all day.