You are going to have to explain this to me like I'm 5. I've pushed those logs up, but I don't see anyway to get them onto the land. The problem is not the water. I can swim. The problem is getting a log onto land so I can fill in the pit and then climb the stairs. I absolutely do not see any way to do it.
** Nevermind. I found a walkthrough. I'd have never got that.