Not sure if this resort has a pool, but it's located on the east shore of Kalamalka Lake in Coldstream (Vernon area). Prices range from around $150 per night up to over $310 for the penthouse suite. I've never been in there, but paddle past it often in the summer.
Edit on the prices, they are significantly higher in the summer, I forgot to dial in the dates when I was checking the rates.
http://www.illahee.com/
More places to stay listed here:
http://www.tourismvernon.com/index.php/accommodation/