>>120183The Wadden islands are definitely interesting, especially if you're a birder. Make sure you're not there in the high season though, and you should be okay. Don't know about kayaking, but note that it is an intertidal zone, so make sure you take a good look at the map and pick a good time.
>>120141In the Randstad (a region in the southwest which conains the major cities) it may be that way, but in the other parts bike routes have great scenery. Pic related, bike route in Drenthe.