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Really anytime late spring through through early fall is fine...it's however busier then and I'd strongly recommend that you stay in the onsite lodging within the Parks (i.e.. Zion Lodge). This prevents needless time wasted getting into or out of the... See More
It, of course, depends on your interests (hiking, biking, shopping, etc.). Austin is nice and has a college vibe. Dallas and Houston have upscale restaurants and their unique opportunities (e.g. NASA Space Center in Houston. See More