I don't think anyone’s mentioned Camden Market yet. It’s a bit of an eye-opener. Don’t just stick to the main street though, make sure you venture deep into all the little market alleys for all the weird and wonderful sights and shopping. There might even be something half decent playing at somewhere like the Roundhouse. Not bad for celeb spotting too since MTV UK HQ is slap bang in the middle.
Food wise, if you’re after something a bit memorable and unusual I know just the place! Dans Le Noir is a French restaurant with a difference: All the waiters are blind and you eat in the dark. Instead of ordering what you would like you order the white (surprise), blue (seafood), green (veggie) or red (meat) menu and tell your waiter what you won’t eat. The chef then makes something to your tastes and you only find out what it is after the meal is finished. It’s apparently all to do with heightening your other senses, mainly taste buds but I reckon most people probably like the idea of playing footsie in the dark.
It’s not for everyone though. Me and Mr CA had a table booked to take a friend out for a birthday treat but we had to cancel because her boyfriend was terrified at the thought of eating in the dark (I can’t wait to go now, just have to re-book!). It can’t be bad though, apparently Prince William and Kate Middleton have been several times. If it's good enough for royalty...