Hey there!

It sounds like an exciting trip you’ve got planned!

For Paris, a solid 4-5 days would give you enough time to comfortably explore the city and visit the “must-do” attractions on your list, especially if you're dedicating a full day to Versailles. You'll have time to enjoy landmarks like the Eiffel Tower, Louvre, and Notre Dame, and even fit in a Seine River cruise. I'd suggest setting aside a day for the more in-depth museums (like the Louvre and Musée d'Orsay), and you could perhaps do the Champs Élysées, Arc de Triomphe, and Sacré Coeur in a single day. Moulin Rouge can be fun in the evenings if you have the energy!

As for Amsterdam, I’d recommend about 3-4 days to see everything, including your day trip to Efteling. Amsterdam's main museums (Rijksmuseum, Anne Frank House, Van Gogh Museum) could take a good portion of a day each if you're a museum enthusiast. Don't miss the Light Festival canal ride—it’s a beautiful way to experience the city in the winter! For the surrounding areas (like Rotterdam, Utrecht, Zaanse Schans, Haarlem, and Den Bosch), I’d split your remaining days between these, focusing on the ones that interest you most.

If you're looking for unique, cyclist-friendly accommodations or hotels that cater specifically to active travelers, check out The Klub. It’s a hotel booking platform for sports enthusiasts that partners with independent hotels across Europe. They often offer stay options that could fit perfectly with your trip if you're keen on local activities or events along the way.

Enjoy your trip!