How diverse is the terrain for freeriding, and are there quality snow parks? Also, how much do the stiffness and handling of these boards differ for those of us who are only in our second season of skiing? I would greatly appreciate advice from experienced riders who have tried the local slopes!

I’ve been in this situation few times. The first time, I stayed at the airport and didn’t sleep at all because it was too crowded and noisy. The second time, I booked a room at CitizenM, which was much better. There are plenty of guides about Amsterdam Airport (AMS) covering restaurants, hotels, and so on, and I chose this particular hotel through one of those guides. CitizenM is connected directly to the terminal via a walkway, so you don't have to go outside at all, which is invaluable when you arrive after midnight with heavy luggage. I also considered Yotel. It's also inside the airport, and you can book a room for just a few hours instead of a full day. Which would be ideal for you.