In a couple of days I am going to go look at a used 2005 mini cooper s with 47,000 miles on it and I was wondering what I needed to really look at closely to make sure I won't be buying some piece of junk

 

It's like any other used car test drive listen for unusual noises clunks/bangs ect...
Check fluids and see if they look clean and well maintained. If possible get service records. Check ALL accessories ect

If you are not a car guy/mechanic I'd recomend taking it to a dealer/mechanic for check out , $100 might be well spent

Some mini dealers will print out service records for you

 

I'm currently looking at the same car but with 92,000 miles. Drove it today, was happy with it, but new to Mini's. Anything particular to look for on an S with mileage like this?