I love the fact that when the weather is nice, the British get out and use the beautiful parks that they maintain. You will see the ones in Cambridge full of people. I am not sure why it seems that they appreciate these spaces more than Americans (it could be because they have such tiny yards). It also can be a cheap alternative to going somewhere else. Yo can often let the dog off the lead if they are well behaved and you are a responsible owner and the same goes for the children! Pack a lunch, get together with friends and enjoy the sunshine!