Make a boat and launch it!
Next time you visit somewhere that has a river or stream or a pond have a go at making a little boat. Find a flat piece of bark or a leaf, make a mast and find somerhing you like for cargo. It is great for understanding the current and flow of water, for balance and precision. Developing those fine motor skills and creativity and aids that all important determination. It doesn't matter how long it floats for, be prapred for it not to it's just about having a go and seeing