• Walking on the Wadden Sea: At low tide, the Wadden Sea, between the northern coast and the Wadden Islands, virtually disappears, and if you're up for a walk in the mud, join a Wadden Walking (Wadlopen) trip and plow your way over land to one of the islands. If you're lucky, you might encounter seals gallivanting in pools left by the retreating tide or sunbathing on the flats.
  • Riding White Bikes in Hoge Veluwe National Park: It was tried once in Amsterdam -- providing free white bikes for everyone to use -- but the bikes mysteriously disappeared and turned up in private hands with fresh coats of paint. The scheme has worked much better in this beautiful national park (which apparently doesn't shelter as many bike thieves). Just head to Hoge Veluwe's parking lot, pick up a bike, and explore the traffic-free scenery.
  • Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.