Just telling them their park is "shitty" isn't going to do anything keep in mind...
Make it professional and explain the benefits of a fully functional park that is looked upon as being "not shitty". More business, more media, yaddayadda...basically you need to paint a picture because the 50 some year old on the other end of this reading your email won't give too shits about making a better playground for the delinquents of the mountain.
Start a page to collect signatures...the bigger the backing behind you, the more serious they'll take it. Hell, you could even start a funding page to raise money for new features.