Any suggestions for something fun in London tomorrow with 6-month old baby?

[naturopath]

Can think of lots of fun things, but without baby. I think rain is forecast, but want to have an outing where baby, DH and me will all enjoy ourselves.

We've already been to the Tate Modern and the South Bank recently. The Science Museum looks like it might be just for older kids..

Any suggestions?

I took DS to the Garden in the basement of the Science Museum aged 8 months and he enjoyed it a lot. Can't think of much else though...it is a difficult age, just before they are mobile.

yes, I just looked at the Garden bit of their website - couldn't work out if he'd be too young. Might give it a go as haven't been to the Science Museum in years..