Is it normal to want to masturbate and get naked on a nature park at night?

I'm a 19yo guy. My parents are going away for a couple of weeks soon, and I will be home alone, all by myself. So I can go where I want, without anyone noticing. Over the past few weeks, I've been planning out an 'adventure'; About 25 minutes from where I live, there is a nature walk park- where people plant hundreds of trees, and there are pathways going around it, benches etc. A path goes from near enough straight next to my house, across some fields, and straight into this park.

My plan is to wait until about 3-4am, when there won't be many people around, and it's very dark. I intend to sneak out of my house, and to the path, which I will then follow all the way to the nature park. Then, when I'm there, I intend to go the main crossroads area, where all of the paths meet in the middle of the park, and strip off completely naked. I plan to wander all around the place completely naked, and masturbate.

There are many places where there is very wet, deep mud, which I also plan on squelching through, barefoot (I have a foot fetish), and eventually lie down in to masturbate, while rolling around, and covering myself in mud.

Occasionally, youths have been known to hang around on there too, usually messing around, trashing the playground. I find the thought of having to sneak around nude, muddy and masturbating, avoiding being noticed rather exhilarating. I intend on doing this until the early ours of the morning, at which point I will return home, just before the sun starts to come up. I may have to return home naked, if I'm too muddy!

Is it normal to want to do this? Am I normal for wanting to?
It's not like I WANT to get caught or anything, but the risk excites me.