The lake contains a big island, which is not visible in the regular OSM (only that there is a forest when you zoom in). In the editor it is visible, that obviously the island was done by its outlines, but not treated in the right way or with the right attributes. In my opninion it needs an experienced mapper to solve this problem. Furthermore, on the island are lots of trails, panoramic views, picnic sites etc. which need to be shown. The person, who will go there to do it, will be rewarded by a stunning landscape ;-)
One more thing: on the lake is a boat line connecting the island with the town but also some other points around the island.

According to the map, here should be something like a ferry service or similar. To me nothing is known, what frequently crosses the Reuss river at this particular point. If there no ferry service exists (or only by occasion in summer months), I suggest to erease it, because it is shown in pedestrian navigation as a possibility to cross the river.

Here is a construction site, where new buildings are constructed right now. The existing buildings on the map were torn down.

"This is a design agency but not a (public) park "
POI name: KOFEIN DIZAJN
POI types: leisure-park
OSM data version: 2017-11-17T20:18:02Z
#mapsme

"This is a design agency but not a (public) park "
POI name: KOFEIN DIZAJN
POI types: leisure-park
OSM data version: 2017-11-17T20:18:02Z
#mapsme