The Keilehaven is being transformed step by step into a tidal park. The functional space will now be a green, future-proof, climate-adaptive, public city park with plenty of room for biodiversity. We apply the lessons we learn in Keilehaven to other tidal parks and riverbanks within and outside the M4H. For example, we are experimenting with collecting floating waste, new forms of recreation and innovative/circular use of materials, water purification and making tidal environments perceptible.