Things to do in London at the weekend?

Travel Info
I'm heading into London at the weekend with 8 friends but stuck for afternoon entertainment. We were due to book Urban Golf (indoor computerised golf) but they're full.

ANy ideas on anything similar-ish basically, something fun that everyone can participate in. Just needs to be in central london - ideally near soho/mayfair ut not too fussed.

thanks

Travel Tips

Do the sights- i know it sounds corny but how much do you really know about England, and London in particular? Other ideas; London eye is near westminister, so is namco world, and also the tate modern. The big super cinema is also down that way, and there are plenty of great pubs and restaurants in soho and covent garden. Enjoy yourself!
Others

Camberwell Arts Festival - http://www.camberwellarts.org.uk/...
Have a wander around China town area you will find plenty to do. Also Wetherspoons The Moon Under Water is a good place to make your mind up. It's in the Sq. Good luck
This is the official London attraction website : http://visitlondon.com/city_guide/...
Visit London
This weekend is also West End Live. There's free concerts on by performers from some of the West End shows on Saturday or Sunday?

Or how about the bowling green at Finsbury Circus? Though the weather doesn't look too good for the weekend.
Don't know, but if the weather men have it right, take a brolly each.