Any of the clinics are perfectly OK for a non citizen. We have utilized a couple of them during our stays in SP, and find the doctors and staff knowledgable, kind, caring, and affordable. Don't worry, go and relax. Only thing, if you have a chonic medical problem, make sure you have enough of your medications to carry you through, since not all meds are available on the island. They can come close, but it isn't worth the risk.

Live so that when you arise in the A.M, Satan shudders & says..
'Oh sh t..she's awake!'