Get a rental and leave your car for the day.
What I've found really convenient was dropping my car in the morning while Bimmersport arranges a rental for me from Enterprise (approx. $35.00 for the day). The rental cost is well worth it with Bimmersports great service rates and quality of care in their workmanship.
Depending on the nature of repair that you need, this option is always there for you.
2003 BMW M3 Vert