Some of this has been said before, but I don't have hardley any friends and the ones I do have, have got lives and are normally far too busy to go on days out with their kids and mine.
Swimming is a great idea, but 1 adult to 3 kids isn't allowed, and as mine don't swim well I wouldn't be confident enough to take all 3 on my own anyway.
Park I can do, but I dread the coming home as Ds (4) will have a right tantrum because we are leaving and it just spoils the whole day.
Games always end in disaster because Dd2 is a very bad loser and so it's generally stressed from the start.
MN is the only adult company I get in a day, occasionally my mum pops in or obviously I speak with the mums at school, but other than that it's just me here doing everybloody thing that needs doing, and neglecting my kids.