Windsor Great Park is a massive parkland area with a Long walk running through the centre. Deer can be found in some parts. It's a sprawling enjoyable place to explore by foot or bike. You can also get here from Windsor & Eton Riverside station too.
It's easy to reach Windsor Great Park, in Berkshire, by train. Simply hop on a train to Windsor Central station and then it's a very short walk away - and what a treat it is.
For more info including facilities and opening times, visit Windsor Great Park’s website.