Hey I'm back from the Netherlands and thought I would share my experiences at the park, I'm not exactly an expert in terms of terminology and specifications when it comes to rides and that sort of thing (which is why I initially didn't intend to write anything about my trip) so I guess this will be just a few general impressions of my thoughts on the park.
Firstly I thought it was a really nice area, the park in general looked well maintained and had a freshness to it's theming(like everything looked new and well maintained, I couldn't really tell which rides were the recently opened ones and which were the older ones for the most part) though there were the occasional spots of wear and graffiti that comes with all theme parks. It was a nice area too, lots of plants and trees and such make up a lot of blank spaces between rides, it was pleasant to just sit among the trees in the more quiet areas and enjoy the surroundings, a lot more green than some of the UK parks I've been to (though I'm guessing that's mainly due to it's location which is pretty out of the way of anything)
The layout of the park could be a little confusing at times to be honest, though they seemed to know that and tried to combat it with lots of sign posts to the various attractions, but since some of the pathways could be quite winding an arrow pointing vaguely in one direction wasn't always helpful. That being said the park itself was pretty enough that it didn't really matter and the queues were never really a problem (the longest wait was for the log flume) so there was no rush and the park was small enough as to allow you to take your time when getting from area to area.
Anyway here are my impressions of the rides, we managed to go on most of the big attractions apart from Speed of Sound which we decided to skip
Xpress Platform 13
I loved the themeing on this ride, you start off indoors and walked through an abandoned train station that eventually becomes more and more twisted (literally for some of the corridors) there was a creepy train conductor on the way and dark passageways to venture through before getting on the ride itself (which involved stepping through some seemingly malfunctioning doors) I'm guessing the ride has a lot more actors to jump out as you make your way through the station in more busy seasons and at Halloween since there seemed to be plenty of spots where they could have popped out though there were still some scares to be had as you walked through even without them, due to sound effects and various other little touches. The ride itself was a lot of fun and a nice smooth experience, though the initial burst of speed that starts the ride can feel a little forceful they do a good job raising tension before launching you around and the track was exciting and gave you nice view of the park. The only complaint I had was the ending, I thought there would be some sort of final scare but there was just a confusing scene with a broken train and some fire, I mean it looked kind of cool but I'm not sure what was really supposed to be happening.
This was a pretty rough ride, I spent most of the ride getting my head rattled around so much so that I could barely pay attention to the track, though the park seemed to recognise this since the restraints were heavily padded to at least make it so it wasn't painful. This was probably the least smooth one of the bunch, I was expecting a feeling similar to flying (due to the bird theme) but this certainly wasn't that, still I don't mind rollercoasters being a bit rough so I still enjoyed it and the totem poles and trees in the area looked nice too, though I'd pick this one last to go on if you are planning a visit to Walibi since it's not exactly unmissable.
I was a bit nervous about this one (though Goliath freaked me out significantly more beforehand) since I'd never ridden a wooden rollercoaster before and this one featured lap bars (one of the only other rollercoasters with lap bars that I have ridden was thirteen and that always gives me an unpleasant feeling in my stomach, though I didn't experience that on either of these so I guess it's just that ride that does that to me) I ended up really enjoying it though, it's a rattly old beast and it isn't the smoothest of rides, but the sounds and rush of it all was a fun experience, I loved the look of it too, perhaps just because I've never seen a wooden one before but I was just impressed by the craftsmanship out of making such a thing out of wooden (which probably sounds a bit silly to say)
Honestly this was probably my favourite ride of the day, the first drop is just breathtaking and so forceful and overwhelming without ever feeling uncomfortable. It was probably the least themed ride of the big ones (though there is a big sign but nothing apart from that) but the scale of the thing speaks for itself I guess. It's tucked away right at the back of the park for some reason but if you visit make sure you don't miss this one out.
We went on a handful of other smaller rides too, el rio grande was a neat little rapids and they had a mini rollercoaster for kids called Drako which randomly featured a single small train as the central theming despite the rest of the ride's decorations being unrelated and the carriages themselves being well themed, but those were the main things of note. Overall it was a great day out and a fun little park, well worth a look in my opinion (though my knowledge of parks isn't as well versed as some of the people on this forum so I'm guessing your mileage may vary)