I don't have many recommended places but, be aware, we were there mid/late September two years ago and the cost of marinas/town docks was very high in the Split area. Over 300 Euro a night for a 45ft cat. It was also very busy as September is peak time for those without school-age kids. The one location we do remember particularly enjoying was the island of Vis, just south of Hvar. Get there early and contact the harbour master and they'll bring you in when/if they have space. If you don't make it onto the dock, it was fine to anchor just outside, weather permitting.