... the Unterbacher See (See meaning lake).
This large nature area with woods, lake, playgrounds and numerous bike trails is literally in our back garden. Oma came over to visit us for the night, so we gave her Andrew's bike and off we went to explore this Duesseldorf beach.
After some time at the huge playground (I did not take a picture, sorry), we were all thirsty and walked over to the beer garden next door (I love Germany for that). They had even thought of putting a sand box next to the tables. And look who we ran into at the beer garden - our neighbor Andrés and his family! Didn't I say it was literally in our back garden?
(This was before Sophie poured sand all over poor Andrés' head.)