that sounds like way too much for a first grader to me.
you sound like a SAHM to me. carry on with your life, and let those of us who need child care during the day handle this.
it's fine OP. bar-t ranch is great -- shady areas, an arts barn, swimming pool, etc are all places where kids can get a break from the heat. they also have multiple water stations throughout the camp area. and the counselors are well trained to be attentive to making sure kids don't get overheated.
for the last weeks, ask your kid what he wants to do! if he picks the activity he'll be more excited about it. you might also find out if there's a friend or two going to a particular camp, as that makes a big difference too.