You obtain the chisel by offering chef butcher help until he send you on the quest to ge tlime and sardines, now you have the chisel. Now you must go and see Dr.Feelgood, look at what you need for the hammer handle, now look at the cheats right here and that should get you most of the items. Now trade for the hammer handle and go visit the spot where the fallen tree is. Now click make, do it again, and again one more time. It should be finished! If you don't have enogh energy (if your shelter is a log bed sleep it, other wise
go and sleep in Mrs.Weeder's bed. Now if all the boat says is examine just keep clicking around you should find use cannoe, use it!