I have been to Richmond park only once, but people who stay close to it swear by it. Its a huge park in south west London. We went there once in summer, started from one end, walked all across looking for a cycle to rent and ended up spending the whole day just walking:) without ever reaching the cycles! Its a more open park than the rest within the city, has huge wide roads, deer running around and space for a lot more activity than the others. Someday I will make a second visit but till then just memories of its expanse stay with me!