This is great for anyone living in the burbs or fancying a bit of a change.
The Children's Discovery Museum in Acton.
Every Friday till the end of August, between 4:30 and 8:30pm both the Children's Museum and the Science Museum portions at the place are free.
The Children's portion is fantastic for little kids, ideally from say 2.5 up till around 6 or so as they get to play with a fake train, water tables and a giant human bubble maker as well as a diner, a jungle themed room, a boat themed room, a theatre and a host of other fun little things for kids to play around with and explore.
Then over to the Science portion, aimed at slightly older kids, but 3 year olds will still love this. There are plenty of things for all ages, especially the musical instrument and noise making activities and water based activities.
Spending the evening here is very easy to do and a lot of fun. Not as crazy busy as the time they were doing the Free Friday event for the Highland Street people, so very easy to get in, park and play. The garden area is a great spot to have a picnic if you arrive early, or just play in the huge sandpit outside if the weather is nice.