London's National Gallery regularly hosts children's programs, Madame Tussaud's Museum offers a photo opportunity with your favorite star, and London Zoo offers a day out (it's the oldest zoo in the world!).
If your budget allows, go to Hamleys, a real children's kingdom (seven floors!) in the heart of London's Regent Street. You'll find everything from radio-controlled models to porcelain dolls.
And when you're tired, grab a bite to eat at the Rainforest Café, where the interior is decorated like a jungle with waterfalls and exotic animals (the latter are toy animals, but they behave as if they were alive!).
The most economical option is to go to Hyde Park; admission is free. The park has an elf oak tree, Lake Serpentine (you can swim in it) and lots of squirrels. Then you can go to the creepiest amusement park in London - Thorpe Park (tickets cost from 25 GBP). There's a huge rollercoaster, an Angry Birds mini-country and a realistic horror maze called SAW Alive.
