I stay at Dolphin a lot and have never seen a spot for free parking, not saying it's not there but have never seen it. You could always park at HS and walk, it's not a far walk. There is a gas station across from BW that has some parking you can also park at. If you really wanted to park at BW, you could opt for valet parking and pay for it, which might actually be less than the Dolphin parking.