Hyde Park

The sheer scale of it hits you first - 350 acres of open parkland right in the heart of London, where you can genuinely forget the city exists. It's part working royal park, part public space, and it works because it doesn't try to be anything too clever. You've got the Serpentine lake for swimming or a gentle row, proper walking paths that loop through different landscapes, and grass that goes on for miles. The Rotten Row path is decent for cycling if you're into that sort of thing. Families tend to camp near the Serpentine for a few hours - kids can paddle, feed the ducks, grab an ice cream. History types might wander towards Apsley House on the corner, though the real pull here is simpler: space and trees when you're surrounded by London's chaos. Free to wander, open from dawn to dusk year-round. Allow a couple of hours minimum if you're serious about exploring it properly. Summer weekends get rammed with picnickers and joggers, so go midweek if you want a quieter experience. It's not dramatic or moody - think gentle rather than wild - but that's rather the point. Lovat Parks is only just over a mile away if you're staying locally and want both a proper holiday park base and access to proper green space. Worth the walk, especially in spring when the trees come alive.