^ To me the glass panes now also look like walls....
I guess you coloured them white....? or made something in the background a colour that gives this effect.
Try playing around with the colour of the glass-panes: the light grey usually makes them completely transparant and looking very natural, some other colours, like a light blue, may also work well here....
The panes on the ground-floor can serve as doors, but if they are supposed to be that, then I think a vertical dividing bar in the middle will do well. The ones on the first floor I think would look more "window-like" if they do have a small horizontal panel or trim at the bottom site (otherwise those poor guests might feel so exposed....being visible from feet to head...

as well as then they "cry" for some visible interior...)
Around the fine pool there now are tables- and chairs, and some "lounge-chairs".
But the scaling of those two types does clash...does not match at all. Now that scaling is really difficult in RCT, so fine if it is not always correct, but I would not place those things together in one spot then....that makes it so obvious. So use one type, or try to make one type bigger, or the other smaller....
I love the green and white ansd soft yellow, attractive combination for a hotel!
Emergo