When there is snow on the mountains, add a sleigh

It would be nice to have a sleigh, when snow will be added to the game. Could be the first simple vehicle, but would still quite fun to drive down a hill. Same simple thing could be done, if there would be rivers floating down the mountains (or even under the earth?) , so you just would need to get into a simple boat to have some fun Would be even better with some large waterfalls.