So or so, I like Utrecht very much, and Haarlem and Leiden, and would be glad to visit these towns some day again - and also I would be curious to visit Rotterdam for the first time.
Many years ago I went by bicycle from Oegstgeest near Leiden via Katwijk aan Zee, Nordwijk, Zandfoort, Haarlem to Amsterdam and via Hoofddorp and Warmond back to Oegstgeest. A very beautiful summer's day and a great trip.