Things for non-local tourists

Here's a few things for real tourists that come to London and want a fun activity that's off the beaten track:

Primrose Hill
Situated just north of Regent's Park this small hill offers amazing views across all of London. Climb up it on a sunny day and sit and watch the clouds roll by.

Critical Mass
Website: http://www.criticalmasslondon.org.uk

Get a bike. Quick! On the last Friday of every month, at 6.30pm under the south side of Waterloo bridge, cyclists from all over London meet and participate in "Critical Mass". The number of cyclists range from under 50 to over 400 depending on the weather and time of year and they have just one goal - to take over the roads! Cycling together as a huge mass of people allows them to fill the roads and take them for themselves. It's a fun time and lasts a few hours until people get tired and head home. Expect slogans like "Two wheels good, four wheels bad" and "More bikes! Less cars!".

BAPS Shri Swaminarayan Mandir (Hindu temple)
Website: http://www.mandir.org

This impressive Hindu temple seems out of place in Neasden but is well worth a visit. Its intricate building was carved by 1,500 craftsmen. It's free to look around and there's an exhibit called "Understanding Hinduism" which helps the uninformed like me.