1) The boring route along the highway... ignore all omleidings and walk through construction if necessary. Sights include the highway, a gas station and some wooded areas.
2) The slightly less boring but fastest route along the train tracks. Includes 3 different tunnels! Presently under construction near Voorschoten. The last time I tried it the path was impassable and I had to take the omleiding- but luckily it wasn't a created by a sociopath and went in a relatively straight line. Sights include several tuinen (little dutch gardens and huts) many ducks and geese and a few ponies. Also, dog walkers.
3) Beautiful route along the river. It's longer but very pretty and very few cars. No omleidings yet...Sights include windmills, rowers, houseboats, many ducks, geese, horses, cows, sheep, goats, gnomes, and other cyclists in spandex.