Vegas and Utah would be HOT in July.... unless you guys are ok with 50 degrees heat. (I'm not)
If you stay along the coast, temperatures are more reasonable. Even Boulder is ~30-35 degrees... a bit hot. Boulder is awesome though, its like an outdoor playground, and the culture there is awesome.
Judging by your descriptions, I would say your best option is probably Squamish/Whistler. For some bonus hiking, Bugaboo's looks awesome (never been, might try going next year).
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