Sunscreen with even the highest SPF isn't close to 100% effective against the sun, so if you honestly spend the entire weekend in the Phoenix sun [[and aren't dark-skinned) you run a very high risk of developing skin cancer.
And biking all day in 120-degree heat would literally be hell on earth to me. I'd rather bike in Nome, Alaska in January, and I don't even like the cold!
BTW, air quality is MUCH worse in Phoenix. Second worst in the country after LA. Look on the bright side, it isn't the two-pack-a-day air of Mexico City, but more a half-pack of cigarette equivalent type of air.
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