I can't say for sure what the rates for hotels are, but they do go up considerably for that 10 day period (Jul 5-14). Figure $200 Cdn (which is about what? $20 USD ) for a 3* room. Book soon as the major hotels fill up quickly.

Here's the numbers for the golf courses:
Tee Time Reservations
(March to October)
1-877-591-2525
(403) 591-7272