I think those "hotels" are in fact more accurately called motels. My understanding of the difference between hotel and motel is that motel has its rooms opening to the outside while hotels always have its rooms opening into the hallway. Hotels tend to be more expensive / upscale than motels. I recommend adding actual hotels with interior hallways to complement the motels in larger cities if that is not already planned.
This might be obvious, but sandbox mode should be about ultimate control and freedom without many constraints. Nonetheless, the sandbox mode should be highly customizable/configurable to allow us to select what constraints to have or to not have (e.g. infinite health or higher health, infinite ammo or higher ammo, et cetera).