In The Legend of Zelda: Tears of the Kingdom, The Missing Farm Tools side adventure can be obtained by speaking with Penn at the Wetland Stable during the Potential Princess Sightings side adventure.
For this quest, speak with Izra who can be found on a dock in the river just down the hill next to Penn.
He’ll need help building the raft next to him. Look on the nearby rock to find 3 items to attach to the raft: steering wheel, fan and battery. Stick the fan onto the back of the raft and stick the battery to the top of it. Next put the steering on the front of the raft.
Once you’ve constructed it, speak with Izra and tell him that you’ll take him to Floret Sandbar. To cut the rope and free your raft, swing a sword at it. Steer the boat down the river until Izra tells you to stop at the dock. Do so and you’ll learn what really happened with the farm tools. With this mystery solved, the quest will complete!