Rotating boats can clip crops and structures onto a boat

First, place a boat right against the shoreline, then place another boat right against the first one. Put two sails and a steering wheel on the second boat, aim it toward the land, and unfurl the sails. Then make sure both boats leave the loading range at the same time. When you come back, the boat closer to land will get pushed onto the shore by the boat behind it, and it will start rotating. This allows crops and structures placed between the land and the boat to be carried onto the other boat by the boat that's stuck on land. If it's a grass raft, just making it rotate is enough.

Put an Ice Flingomatic and a Sail on a boat, and plant some crops on land. Unfurl the sail first, then turn on the Ice Flingomatic. It will keep firing snowballs endlessly because it can't actually reach the crops to irrigate them.