This is Europe trip #14 for me. As such, I and my family have spent significant time in nearly all European countries. We have a strong sense of what we like.
We are flying into Paris because it was a good deal for lie flat business class tickets direct from our home town Seattle. The 10+ hour flight leaves at 4pm, so it's great timing for minimizing jet lag. Get on plane, relax with a glass of wine, eat dinner, read a bit, get 5-6 hours of decent sleep. We bought the flight, not the destination per se.
When we arrive it seems a shame to waste a single well-timed flight by waiting around for another flight and more travel time. So instead we decided to go into Paris and enjoy an afternoon and early evening.
Then Loire because we like France and we like to do short bicycle tours. 4 or 5 days riding on scenic calm roads with good sites and great amenities. As our kid is riding her own bike, it's quite important to us that we cycle in places with a lot of cycling infrastructure that are relatively flat and where drivers are very used to bicycles. This tends to limit destinations. We've done the low countries quite a bit lately, so are looking elsewhere.
After 200km cycling, we are ready for the city. We like many cities, Paris included, but visited Paris last summer. Vienna is our hands down very favorite big European city. We don't mind a transfer day after the bike riding. So zip back up to Paris, early lunch and one easy site, CDG, 90 minutes to Vienna, in our Vienna apartment for dinner.
3 full days to see things we like seeing and do things we like doing in Vienna.
Then easy train transfer to Salzburg, pick up bikes, 5 nights in the outstanding Tauern area bicycle touring. Again, gorgeous riding, enough interesting sites, excellent amenities.
Then the two nights in Copenhagen. It's quite directly on the way home and cuts almost two hours of flying time off the long day on the way back. Copenhagen is I think one of the very best 36-hour cities in the world. And we very much like Tivoli. It's an absolutely charming place when you look closely at all of the small details in the theming and upkeep. It has a lot of hugge. We like all of the places where you can sit down and have a drink and a little something to eat in a stylish atmosphere. Many of these places have cozy blankets laid out for your use. We like that there are places with open roaring hardwood fires, and that you are responsible to keep your own children from falling into them. Imagine that at Disneyland? Impossible. We like that the Tivoli marching band is super quirky, looking a lot more like something you would see at Burning Man than in a theme park. Our kid likes it a lot too - she notices details and appreciates them.
One thing to understand is that because we do a lot of the traveling from place to place on our trips by bicycle, longer or more complex transfers in the trip don't feel as taxing as if you are using public transportation or a rental car for all of your shorter journeys between one place and another. We'd much rather do short convenient flights to connect up the places we really want to be than spend time traveling by train stopping in places that we might otherwise be less interested in.