Some local insights: Kaion C. mentioned feeling a little weird walking here since the trails don't look official or regularly maintained. That's a good point. Having lived or had family ties to the area for decades, all anyone ever thought of the place was a big "empty lot" type feel, where people dumped trash, let their dogs run, kids went to have some beers and maybe smash the bottles, and any trails just happened randomly, with no maintenance. Just the annual fire clearance workers who clear the land in early summer with weedwackers and chainsaws. But life evolves, the SM Conservancy (?) got the land, and put up a sign for Heidelberg Park. I was like what?...who's calling this a park?? I have never seen any maintenance except the wood fence and signs at the upper/main entrance, and I assume the trash can across the street gets emptied, at Moon Canyon parking lot. To us, it's still just the local chunk of open land, and I guess it's just random people voluntarily doing any type of cleanup or trail maintenance. Some trails have gotten overgrown, never to reappear. But overall, over the years, with people being nicer and cleaner and appreciating nature and animals more, the park is nicer now than it's ever been. Some trash blows into the park from the street and trash collection, and coyotes and raccoons seem to occasionally bring trash in, sometimes shredding it all over the land, and of course there is still some littering and stuff like that, but otherwise it can be quite beautiful. Be ready for some narrow, steep trails, where the only maintenance is the footsteps of people and wildlife. Also, for those who don't know, we share the area with coyotes, skunks, raccoons, and others. Generally only evening/night, but coyotes are occasionally out during daylight. In the unlikely event one is bold enough to think about eating your small/unaware dog, I believe the right thing is to get mad at it and chase it off, they basically know not to mess with humans, especially angry ones.
Hope this was helpful Enjoy the park read more