I've now ...

Removed the descriptive name for the pond ... https://www.openstreetmap.org/way/1084463712

Removed alt_name as Leikkipuisto Sanna is another object within this park. Added old_name to support the signing still found on site for the Susannanpuisto object ... https://www.openstreetmap.org/way/138661349

Combined duplicate playgrounds and modified name to "LEIKKIPAIKKA Sannanpuisto" to emphasize that it's in fact the name of the playground and not the park. ... https://www.openstreetmap.org/way/1084463715