We were there at Christmas and stayed north of the cut. The cost for the ferry was never the same. Always after 8 pm we were charged 5 blz to go across in a cart. We were charged on Christmas during the day, but for only one way. Some days we weren't charged at all during the day to go back and forth across the ferry and some days were charged one way. The signs on either side of the cut stipulate that all charges are for after 8 pm. We just paid when we were asked, which was not often, and felt like we were getting away with something when we didn't have to pay.
We stayed a little south of Casa Teritsa and I have to tell you when we walked by we had to peek in the windows - it was beautiful, nice big lot with lots of palm trees and it's own pier. It was in a section of really nice houses. If you are looking for serenity I would recommend there, however if you are into the bar and late night stuff you may want to stay in town.
Time flys - have fun!