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i will visit the USA
(CA+AZ) in June 2010.
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If you're coming to AZ in June, be prepared to be really warm
You should take a day or so to visit the Grand Canyon - a bit cooler up there than in the lower elevations of AZ (unless you decided to make the trek to the bottom of the Canyon). Like Muir Woods, it's something that just has to be seen in person to be fully appreciated.