The best place for a glass of wine*. It's the perfect balance – not too formal, not too informal either. Food is consistently good. Lamb's Conduit Street is a little oasis in the midst of Bloomsbury. (*slightly overpriced)
Also the Queens back garden, these beautiful grounds are great for a Sunday stroll to see the pelicans or to feed the squirrels. Duck Island Cottage is worth a look too, a idyllic little cottage situated in the grounds which was specially built as the bird keepers home.
The Greenwich Observatory with its green laser beam can transfigure any night sky. If you decide to cross the Thames via the foot tunnel, make sure you look out for the green ray. You can be on one side of the meridian in a minute, and cross to the other side on the next, without even realising it.
Arguably the best café in London – or at least East London – with an incredibly welcoming atmosphere, delicious array of food and drinks, and hypnotising views to Broadway Market. Visit early in the mornings, for a roque-monsieur at lunch, or to get lost in their cheese selection at the market stalls on Saturday. Warning: addiction likely to occur.