You are both welcome.Your son will love it.You can swim in the river when it's hot.Yes Bring you tent.Showers are good,toilets are ok.Leave the wife at home.She is more than welcome,but will probably hate it.You may be able to sneak in some rides around abbeyard with your son.May be officially frowned upon by some club members,but you would not be the first or the last.
Having fun and spending some time doing things you both love with the kids sounds like a fine idea. Don't let irrellivant tools spoil your fun.