Popular excursions from Split include medieval Trogir (website: www.trogir.hr), a mini city on a small island connected to the mainland by a bridge, and a UNESCO World Heritage site. The coastal town of Omiš (website: www.tz-omis.hr) also draws visitors, most of whom are lured by the challenge of white-water rafting in the nearby Cetina Valley. However, for many people the biggest pull is the islands, with Bol (website: www.bol.hr) on Brač and Hvar Town (website: www.tzhvar.hr) on Hvar both being manageable as day trips. All the above excursions can be done independently by public transport, or as part of an organised trip with the travel agency Atlas (tel: (021) 346 333; website: www.atlas-croatia.com).