Your responses have let me know I may be missing some minor things, but aside from massaging numbers, I am thinking about the right things and not missing any MAJOR items...I appreciate your input.

Maybe send them tickets to a show or a gift certificate for a massage and explain what your looking to do.

Even better, how many Margaritas you can be sipping during your massage on the beach, while your money is working.

One Massage Therapist went from paying $600/month + utilities elsewhere to sharing a beautiful studio unit with another for $275/month inclusive.

We ended up going with Ace's Royal Brand Exterior Acrylic Latex (fog rolls in gray). 

its an acrylic based grout that resists water penetration, stains, mildew and mold so it has the benefit of epoxy without the price tag. 

Good quality Silicone coatings are common, but a high-solids acrylic may work just as well. 

Niagara massaging shower head with that the residents love too. 

Look into Med Massager Chiropractic massager.

It depends on the subfloor.If I have clean concrete (not too much adhesive, paint etc) I do stained concrete (acid first then marbleize with acrylic)If I have concrete which cannot be stained I tile.