Hi! This one is definitely not a pond, but a covered reservoir: https://www.openstreetmap.org/way/1268032357 . The water is not seen from above, only the roof. I guess https://www.openstreetmap.org/way/1452441995 is the same.
Also, https://www.openstreetmap.org/way/220701091 is definitely a full-scale bridge, not a boardwalk. Wooden surface isn't what turns a bridge into a boardwalk.