you cant sail boat in inlandsea, the place is not sea as such, more like a huge lake. At some places the water not too deep, you can swim it, but make sure you keep an eye on the little one because sometimes the current a bit strong. Before you know it she/he would be 100 metres further from your spot. And also the further you go, the bottom goes deep very sudden. If your kid not a strong swimmer wearing arm band is advisable.