Spend time with your date one of the best pools in London, the London Fields Lido. The pool is heated, which produces steam rising off the water on colder days. It's only £4 for a single swim, and there is a great terrace to catch some rays when the sun comes out. The Lido has a cafe serves a great espresso for £1.20, as well as munchies like wraps and baked potatoes.