These are some signs I made for my own parks that I decided to share with the community. Not my most complex or detailed work, of course, but it can save you the time of building them yourself.

To use:
1) Subscribe to a sign set.
2) Place the sign set somewhere in your park (there are 5 signs grouped together in each set as separate "buildings").
3) Duplicate a desired sign and place it where you want it.
4) Edit the sign ("building") and fill the desired sign text slots with park attractions/points-of-interest.
5) Remove leftover sign slots.

Currently there are only 2 color choices (Blue and Black). Depending on demand, I may add more variants.