I am not 100% sure but Galaxy doesn’t sell day pass for their pool complex. Only access to Galaxy water park is being their hotel guests.

On the contrary, one can pay to enter the Studio City water park without being their hotel’s guest. Heck, they even sell cut the line pass. Currently, there is stay and water park package rate available which is more expensive than the room itself. This all leads me thinking there is no free access for hotels guests.

I sure hope I am wrong.