Roughly 50 degree water temps are correct.
I can't help you with an LDS for rental that is convenient to the Westin. The shop I dive through is in Woodinville, half an hour east and definitely AWAY from any dive sites.
If a site I know is selected, I'd be happy to have lunch with you Saturday and guide you to where it is. I'm not familiar with that many sites, myself -- I'd probably go for the Edmonds Underwater Park, which is shallow but rich in sea life. But others will have, I'm sure, other and perhaps better suggestions.
I can't help you with an LDS for rental that is convenient to the Westin. The shop I dive through is in Woodinville, half an hour east and definitely AWAY from any dive sites.
If a site I know is selected, I'd be happy to have lunch with you Saturday and guide you to where it is. I'm not familiar with that many sites, myself -- I'd probably go for the Edmonds Underwater Park, which is shallow but rich in sea life. But others will have, I'm sure, other and perhaps better suggestions.