I just picked up my first Mini, an '06 R53 with 95k on the clock. The motor mount, belt, tensioner and balancer have all recently been done. Whenever I buy a car, I do a full tuneup and maintenance so I have a good baseline. Besides, oil change, plugs and wires, what else should I do?

 

On a mini, the inspections are basicly...
Oil change at 15,000
Inspection 1 at 30,000
Oil change at 45,000
Inspection 2 60,000
Oil change at 75000
Inspection 1 at 90,000
Repeats....
Then add calendar items....by months from production...
Brake fluid flushes and radiator coolant....
You can look at the list if stuff "inspected" during the inspections...but it covers most everything.
Belts are listed at 60,000 (most do sooner, especially if pulley equipped)
Also sparkplug... If you have a pulley..you SHOULD be following the JCW sparkplug changing requirements, which is at EACH INSPECTION.....
Many folks do the manual tranny oil/diff at some interval they like...might be a good time IMO.
No real 100,000 "service" on a mini...
Look stuff over...take it from there.