Each kid can play 2 games a week a day! The adult can join to get 'free' games with their kids for ? $25? Shoes run into real money, but I still went every other sunday 2 summers ago.
(I couldn't find shoes for under $40, and I knew they would outgrow them after 1 summer.) So $5 or so each for shoes for 2 kids, and sometimes me ( I should buy my own). Still enjoyable.
Find out (you can even ask) when they're not too busy, because they take paying customers first, and leagues always bump everyone else.