First, I took the Maastunnel and cycled around through Pernis and back to Schiedam using the Benelux fiets tunnel. Fun!
(This wasn't planned- I'd heard of the tunnels from BicycleDutch posts, so when I cycled past one on my way somewhere else, I decided to have a go. )
View from the southbank toward the north entrance (and euromast) across the water.
I cycled under that!
Here are some great posts about these tunnels and their history from BicycleDutch:
(Includes a translation of the poetry that adorns the walls)
But be sure to follow the rules!