I took a day trip to Hvar by ferry from Split. The ride takes about 2 hours and is quite pleasant. The ferry port of Stari Grad is about 2 km from the Old Town, but there is a very nice walking trail along the coast. There I rented a bicycle to explore the plain, which starts right behind the town. The local tourist office hands out maps, but these are not very detailed, and there are no signs at all for cyclists. Still, a ride through the fields is rather nice, and you can see several historic buildings such as churches, as well as lots of stone walls. The problem is that it is hard to imagine the ancient land division from ground level - you would have to take a bird's eye view for this or at least ride up the surrounding hills. So if you didn't know in advance about the historic importance of this site, it would look like any other set of Mediterranean wine and olive fields. The Old Town is part of the WH site and is quite well-preserved, but without any stand-out buildings. Hvar is a beautiful island and certainly merits a longer holiday - a day trip from Split just to see the plain is something for WH collectors...