https://www.openstreetmap.org/way/508743351#map=18/48.88551/2.37541
I would just map the deck, with this kind of tags:
highway=pedestrian/footway
layer=1
access=no
foot=yes
surface=wood
width=2
Either as way-lines, or as area-multipolygon with area=yes
Tnx, i ‘gave it a try’ .
If someone else can give it a ‘more convenient’ outlook, go ahead, all yours …
off-topic :
when i search in googie for “Baignade de la Villette map” , there is NO MENTION of that place in OSM , but when i search in DuckDuckGo, OSM-link is on top .
That is why i have put this topic there.