Ideas on making spa more visible

Hi everyone,

I was wondering you I could pick your brains for ideas on making my spa more visible from the street. I'm on a second floor, the front door is facing the street. Due to by laws in the area I'm not allowed to put any signs on the building, no awnings and no permanent street signs. I do have two rather large A-frame boards, one right outside the street door and the other on the sidewalk.

I've been here for three years, I have a good clientele but its starting to get me down...

Ideas on making spa more visible