Wasn't this sort of done in the Justice League cartoon, in the "Secret Society" episode? Grodd uses his mind to bring out suppressed frustrations between the JL members, so they split but later come together again after bonding with training exercises or something. Camping sounds like more fun.
Why is J'onn totally fine with the giant campfire? I thought fire was basically kryptonite for Martians. Flash even mentions it three scans up.