Go to the X5 World home page and look up the maintenance schedules. The vehicle would typically be due for Inspection I, at 30,000 miles. You can decide whether you want to do it at the dealer or not, but at the very least it gives you a checklist of what to look over. I would start with changing oil and filter, and checking all levels.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue