Of the parks you're planning to visit,the only one I have experienced is Efteling.
It's a wonderful park and I'm glad you're spending more than one day there as it's definitely a two day park at least, if it's busy when you go you could even spread it over a day or two more tbh if you want to see everything the park has to offer!
Are you staying on site? The hotels are gorgeous.
Things not to miss -
Ravelijn - This show is ticketed, you have to get tickets from an automated booth which is opposite the entrance to the arena .it's free to watch but on a busy day the tickets get snapped up , it's worth heading there fairly early so you can get the pick of which showing you want.
Also the Aquanura water and light show plays a couple of times throughout the day on the main lake near the front of the park, it's worth catching , times are advertised in the maps.
Baron/De Vliegende Hollander/Joris en de Draak/Python for your big ride fixes
Pagode/Symbolica/Droomflucht at least for dark rides (Pagode is a big revolving viewing platform , the views are stunning especially on a sunny day or at night.)
The ride reliability has always been pretty good when we've been and the queues can get huge but generally move fairly swiftly.
Food - the food is generally of a great standard park wide, I can recommend the unox hot dog type sausages which are available at stands around the park, the potato on a stick :lol , pancakes from Polles Kitchen near Symbolica (they are expensive but inside the restaurant is really cool and themed)
If you get chance , make time for a wander through the fairytale forest, it's really charming.
If you want to know anything else let me know and I'll try to help
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