The north of Barbados is the most rugged and least visited part of the island, but nonetheless offers an excellent variety of places to explore. The most popular target is the Barbados Wildlife Reserve , home to hundreds of green monkeys and a host of other animals; nearby, there's an old signal station and a nature trail through the forest at Grenade Hall , while the lovely park and desolate ruins at Farley Hill make a good place to stop for a picnic. Just north of here there is a working sugar mill at Morgan Lewis and a superb Jacobean Great House, St Nicholas Abbey .