I've visited Gocek several times and enjoyed it, it's got some lovely little boutiques along the Main Street, and one or two nice bars. But... Half a day is plenty! The market is disappointing, don't bother. The boat trips are ideal really because you can enjoy the journey, and have a couple of hours in Gocek, any longer and you would be bored. So don't rule it out, but don't go with high expectations either, it's also a bit expensive, I suppose that's because they cater for the yachting fraternity !