I, too, live in a pretty hot, sunny area, so perhaps I can answer some of your questions.
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1) How much sun is ok?
Technically, none. As in, any exposure to the sun without sunscreen and hat, and preferably sunglasses, is not pleasant. For myself, I burn in two-five minutes, depends on the day. Note: Busses and car rides are a risk also. I burn on busses when I sit by the sunny side window in the summer! Sunscreen is a must in the car as well.
However, if these precautions were taken, there shouldn't be ill side-effects to being outdoors. I've certainly gone on prolonged hikes and came out of them just fine. Remember though that if you're playing around with water, or if your son is sweating, most (maybe even all, regardless of what they say) sunscreens have to be reapplied every 80 minutes. I've gotten to the ER with second-degree sunburns in my life, and it's NOT pleasant in any way.
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2) Did you like the beach, what accomodations should I bring, umbrella, long sleeve clothing (of course hat and sunglasses)
Water is a prism. It focuses sunrays. Anything in the way of burns that happens underwater, happens bad. Preferably, don't let your kid go swimming without a long-sleeved shirt and shorts, and sunscreen all over anything that is not covered.
I, myself hadn't gone to the beach or to a pool for years and years. I am not terribly drawn to water, and consider the risk not worth the reward, but that is of course individual preference. My little brother loves the pool. He hasn't got albinism, he's just very pale-skinned, so the long-sleeved shirt and sunscreen all over with reapplications throughout applies to him.
Perhaps, going to the beach should be done in the cooler hours (before 10 a.m. or after 6 p.m.) The doctors recommend it for everybody anyway.
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Should we move????
I really don't think so. I've lived in the desert most of my life, and I am still hale and well, except for two or three very unpleasant incidents because of my having been an irresponsible child that got away from her parents' eyes for too long. So long as precautions are taken, your son should be fine.
I would install some sort of blinds in the house, however... Occasionally the light gets too bright, and that could be rather unpleasant, or even painful. The house should serve as a relief.
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4) Is hiking outside ok?
Yep. See above.
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5)How much son was enough?
I shall assume you meant 'sun' here... Um... well, sunlight is, unfortunately, necessary. It's good for your bones. Sometimes I think I would ahve preferred to never see the face of it again but that might have more to do with my aversion to early mornings than to my albinism. ;-) As far as exposure to sun goes - it seems to vary with the person. For me, a few minutes, even behind a bus window, are enough for mild redness, hot slightly burned skin and hurting eyes. I always walk around with long-sleeved shirts and a hat. I try to stick to indoors activities during the sunnier hours of the day... but it hasn't stopped me from going outside for all my needs.
I hope that helps.