I may need to visit Vancouver in June and I am wondering if there's any good casino hotels and the best way to find a great provider.

Well the most local spot is probably the river rock casino in richmond. You can easily skytrain right to downtown vancouver. The hotel is nice enough and the casino is lots of fun with great entertainment and big name acts coming through the show lounge as well.  
As far as providers go I'm just starting as a new provider and welcome you to check out my website www.escortladyj.com
other than that I suppose you could look at reviews for the Vancouver area. Good luck I hope you find someone extra special!  
xoxo
J

What a beautifully executed website Lady J. For someone new the biz it is obvious that care and meticulous attention to detail have been put into creation.