Something to do on Saturday

[se15mum]

So we have friends coming to stay this weekend arriving Saturday

They have an 8 and 5yo we have a 4yo and nearly 2yo

They are traveling my train into padding tom and will have an overnight bag

Initial thoughts were London Zoo - we'd drive out their car in our boot they'd get can / trains back

Still a bit of a faff

Any alternatives of something to do for the day and especially if the this rain continues!!!

[esme]

Museum? (either one of the bigger ones or Horniman)