Another good thing about Rotterdam is the amount of green space available relatively close to the center. Next to the Kralingse plas and the Vroesenpark you can also hang out at the Bergsevoorplas. It’s located in the north and just a 15 to 20 min ride (by bike) from the center. You can also hop on tram 4 in the direction “Molenlaan” and get off at “Bergse Dorplaan” and walk down the small shopping street. The Bergsevoorplas is part of Hillegersberg, a more upper-class neighborhood of Rotterdam.
As I live in the northern part I like to go running at the Bergsevoorplas. It makes you forget you are living in a busy, lively city even though it’s just 10 minutes away. If running isn’t part of the plan then sit down on the grass or on one of the many benches around the lake. The restaurant Gauchos (Argentinian steak restaurant) is located at the edge of the lake and has a terrace with a great view of the lake and, though a bit far away, the skyline of Rotterdam.
A great spot for a walk, a picnic in the sun or a lazy nap on the grass.
ps. don’t go swimming, due to the continues heat some dangerous bacteria took over.