And, also for the Boardwalk, Fantasia Gardens has a large parking lot and it is directly across from the Swan/Dolphin.
Another option if you are turned away from GF: exit GF and as you are driving away you will be alongside the MK parking lot. Stay in the far left lane and there will be a turn lane for MK parking. If you turn in, you end up in the parking lot. This turn-in lane does not direct you to the parking lot entry plaza and toll booths... in fact, there is no way to get to the parking lot toll booth entry plaza... you just find a place to park. Parking is allowed or else there wouldn't be a left turn lane with a sign pointing to MK parking. This is a perk for cars/guests who enter from behind the MK or GF/Poly/CR areas.