From Baltimore: 

I-95 South to Route 175 (Columbia).  Follow Route 175 West for 5.3 miles. Turn left at Vantage Point Road, follow for 3/10 mile.  Turn right at the OAKLAND sign.  
  -- or --   I-695 South to I-70 West. South on Route 29 to Route 175 West (exit 20b).  At 2nd stop light, turn left at Vantage Point Road, follow for 3/10 mile. Turn right at the OAKLAND sign. 

I-95 North to Route 175 (Columbia).  Follow Route 175 West for 5.3 miles. Turn left at Vantage Point Road and follow 3/10 mile; Turn right at the OAKLAND sign.  
  -- or --   Capitol Beltway I-495 to Route 29 North (Columbia). Follow for 14 miles to Route 175 West  (Exit 20B - Columbia/Town CenterExit).  Turn left at Vantage Point Road (2nd stop light), follow for 3/10 mile. Turn right at the OAKLAND sign.