Cirencester Park

The main avenue stretches dead straight for nearly two miles, lined with ancient trees that create a green tunnel regardless of season. Cirencester Park isn't a nature reserve in the strict sense - it's a proper country estate with formal gardens, woodland walks, and open parkland that feels genuinely wild once you venture beyond the manicured bits.

You can wander the grounds freely, which is the best part. The avenue itself takes about 45 minutes to walk the full length, but most visitors stick to the woodland paths that branch off into the estate. Kids either love it or get bored after an hour - depends entirely on whether they're the type to spot wildlife or demand ice cream. Serious walkers should allow two to three hours to properly explore the perimeter routes.

The estate sits directly adjacent to Cirencester itself, so it works perfectly as part of a longer day out combining the park with the Roman town and its excellent museum. It's free to access, though the main house itself usually isn't open to the public. Spring and autumn are genuinely lovely for walking here - the summer crowds thin out considerably by September.

If you're staying at Cirencester Park Caravan and Motorhome Club Campsite just down the road, this is practically on your doorstep. Hoburne Cotswold Holiday Park, about four miles away near Cheltenham, would make it a nice half-day excursion. Worth noting: parking is somewhat limited, so arriving before mid-morning beats the weekend crush.