Ibiza - transportation from port to Dalt Vila

Hello all - I'm just wondering if anyone has any info on inexpensive public transportation venus for getting from the cruise ship to the Old Town? Is there a boat that goes across the harbour? Port Shuttle busses? I've been researching Ibiza for a while, and most info I find is quite vague. Thanks again :)

Ibiza town is very small. If you don't want to walk then a taxi would be very inexpensive.