Time Out says
Flussbad Oberer Letten is a hang-out for Zurich hipsters. There's much more to do here besides swimming, but do ensure your body's in shape.
The editors of hipster-bible Monocle never get tired of pointing out the 'Badis' as Zurich's unique attraction. And this one here is definitely the Badi of all Badis. Whether you lounge around on the wooden panels of the right bank, play a game of beach volley, enjoy a glass of Spritz from the container bar, or join the sun-hungry at the concrete structure of Pier West on the left bank - do ensure your body is in shape and your tattoos are all polished up. Walk up the left bank for the longest swim: the current takes you all the way to the lifeguard at Pier West.