To get to Mariner's Point:

From Interstate 5 take the Sea World exit and head towards Sea World.  Stay in the right hand lane but DRIVE PAST Sea World and take West Mission Bay Drive turnoff.  Again, stay in the right hand lane and the road will loop up and around and again you will be on W. Mission Bay Drive.  Drive over the bridge and then TURN LEFT at Mariner's Way.  The Bahia Hotel will be on your right.  Follow the road onto the sand and you're there.