sleep away camp for ADHD tween boy?

I don't know that ADHD is a big factor in camp enjoyment. Our son also has been diagnosed with ADHD and hasn't had any issues with that at camp. Sleepaway camp is a great experience, but if he hasn't been before, I'd look for a 1 week max. Maybe you mean Camp Jack Hazard? I believe that is all outdoors/tents but I'm not 100% sure of that. Many sleepaway camps do at least one night under the stars as a break from the cabin, so this is definitely something to investigate by calling the camp to ask, if it's a dealbreaker for him.

I highly recommend Camp Winnarainbow sleep-away camp!  Our (adopted) child, who has ADHD and PTSD -- which has similar manifestations to the autistic spectrum -- spent two weeks each the summers after 7th and 8th grade, and it was a fantastic experience for her. 

There's really "something for everyone" at Camp Winnarainbow -- and NO SPIDERS!

Everyone sleeps in teepees, not tents. The floor of the teepee is completely covered.  One is *not* sleeping directly on the ground. So please don't let "imaginary spiders" be a deterrent to participating in this fabulous camp.

She learned to juggle, which is an activity that suited her, and I would imagine would suit most kids with autism.  Their juggling instructors were the best!

(She would have kept on going after 9th grade but at a certain age they expect you to become a junior counselor (with somewhat different wording) and since she was very immature for her age, she wasn't interested in taking responsibility for others.  Although she did spend her time with the younger campers... I met two nine year old girls were crazy about her!)

Anyway, NOW is the time to sign up for Camp Winnarainbow!

And you may know, they have a bus that picks up the kids at Live Oak Park.  Before they get on the bus, they need to present a medical certificate from their doctor, and their heads are examined thoroughly for lice before they are allowed to board the bus.  So not ony no spiders, but no lice either!  And she reported that the food was delicious.

Finally, she went up on the bus, but I picked her up two weeks later, so I got to watch the amazing performances of the "circus"! 

As Wavy Gravy says, "We're not training kids to be circus performers; we're training them to be *balanced in life." 

 I would highly recommend Camp Trinity sleep away camp.   My kids both have ADHD and thrived there.  Camp Trinity to a child's eye is unstructured fun.  But an adult can discern the daily structure (regular mealtimes, nightly campfire with singing camp songs, daily swim hole swim, weekly platform (ie cabin) chores) interspersed with a host of super fun kid activities that they can choose from daily like ceramics, photography, horseback riding, small animal care, hiking, gardening, cooking, crafts, rock climbing, wood and iron working or just hanging out under an apple tree with a book. The camp is set in a gorgeous setting along a tributary of the Trinity River, and has been in operation for years so the staff is well versed in how to keep kids engaged but also how to deal with kids with kindness and compassion.  Camp Trinity has a philosophy of community and they really foster that amongst this kids. Because it is located about 7 hours from the Bay Area, there are medical staff there to dispense your kid's meds if they need them there AND to treat any urgent medical issue that comes up.  They also have buses that bring kids up from the Bay Area and back.  My kids have had a wonderful experience at Camp Trinity over the years, have made lifelong friends, and I highly recommend it. 

One of my kids has ADHD and loved Kennolyn (in Big Basin near Santa Cruz). It is GORGEOUS and there are kids there whose parents went as well. It's close enough so if you need to do a middle of the night pickup you can but far enough that it seems like a magical enchanted forest. It's pretty popular (and kind of pricey) but it was worth it for the joy my child experiences year after year there.