Sympathies, I had the flu over NY and am still recovering. My advice is to not go too far as the post flu fatigue is awful, esp with parenting duties on top of that. Can't you take your 3 year old to the cinema? Maybe Greenwich to get out of the triangle? I'm pretty sure they have a Sat morning kids club. Then go to the Cutty Sark (my 3 yr old nephew loved his visit there recently). Not much help, sorry!