I know they’re a bit divisive, but I’ve recently started wearing cargo trousers to parks, and I have to say, I find them brilliantly practical! I now have a pair that has numerous zip pockets on it, as well as numerous button pockets, so I’m certainly not short of secure pocketing options!
Personally, I find it works really well, because I can use my phone, for instance, to do things like take pictures and do dispatch timings in the queues, and then just slide it back into my zip pocket before getting on the ride!