Hollow Trees Farm Trail is just outside Hadleigh (over the border in Suffolk)- probably about 25 min drive from Colchester.
You can buy animal feed from the farm shop and then spend as long as you want going round the trail - it normally takes us about an hour - and then you can have lunch or tea and cakes in the cafe attached to teh farm shop or even take food to have a picnic round the trail - v nice!