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You can just teleport someone on the boat. If you are standing next to the kid on the bridge the boat is visible with teleport skill. When you climb the ladder the door upstairs is open. Talk to the mom before you start the fight and you can gather cool stuff from the house. :)
Just get a character with 15-16 strength to throw a teleporter pyramid to the other side of the bridge, (It can be thrown to the side of the bridge facing you with no consequences) and then use the other pyramid to teleport everyone else to the other side.
You can use Mari's Hatch Key to open a hatch in the floor (you have to move a crate to access it) to get to the cellar. In the cave you can teleport a party member to an elevated rock ledge and use pyramids to port your party up to an area with a tortoise named Betty for a quest.