The Netherlands? How nice. I hope we don't disappoint you. Regarding riding fast, I kmnow what you mean. I like that too. You can always just get up really early in the morning and ride before the crowds show up.
I have a car and I've enjoyed riding "rail trails". You know, converted railways to paved bike paths. They are very straight and engineered for gradual elevation gains. Nashua, NH has one that is 11 miles long. It's mostly uphill going North but then mostly downhill coming South.
But my all-time favorite rail trail is now the Cape Cod Rail Trail which begins in South Dennis, MA (exit 9 off Route 6) and ends in Wellfleet, MA. One can go fast and even rack up as much as 22 - 26 miles each way! The "Cape" also has gorgeous beaches.
If you are without a car and want to ride from where you live, then keep researching, there are lots of bike clubs and preplanned routes on fairly nice roads that can be found.