It's not even good planning. You have top-down design and you go with "sparse and plain"?

The main path should be underlit. Literally, like ground lights. Make 'em programmable, charge a small fee to have people run lightshows on 'em. Multicolor, make it as garish as a 1337 totally-pro-gamer PC. Make 'em hot enough to melt snow. Paths should be made based upon how people walk, use foot traffic data to find out where to build them, and make them on the most trafficked areas. Straight line or curved, the most natural routes makes for a better park experience.

Have lots of bushes. Roses, poison sumac, dolls eye. Make the prospect of sneaking through them ACTIVELY harmful, but defensible as they're all aesthetic plants, then put a cute little mini-fence around them to keep out dumb kids off their leashes.

You'll have an awesome tourist trap of a park destination, a marvel to check out if you're driving through the area, day or night... That's overtly hostile to people who don't follow the rules.

If that's not enough, hire a bacon vendor to give free bacon to everyone who enters as part of the tourist trap aesthetic. Maybe make it a bacon rose, to mesh the themes. They can act as secret security, and deter sex pests by having a guaranteed population present.