No real set trail and the maps are worthless. Make sure you hike and navigate based on landmarks, rocks, water tanks, etc. It has a little bit of everything which is nice. Boulders, narrow paths, self made paths, flat, hills, flowers, shrubs, etc. If you go through the entrance gate and drive about 3/4 of a mile up the hill there is parking, bathrooms, welcome center, etc. There is also a picnic area there with tables. I really liked it here and who knew Hemet had such and awesome place to hike. There isn't a lot of shade so bring a hat. Also, driving to the park is a little strange, lots of turns, narrow roads, and neighborhoods and then all of a sudden the park entrance is there.
Information on the trails here is hard to find. And the map this website offers is in no way accurate. I just went up the first time this evening, and I was a little disappointed. While the view is pretty damn awesome, and certainly going up with very worth while, the lack of good maps and information for this place made my trip rather dull.
First, Google Simpson Park, Hemet, CA. It will show you were the park actually starts. The trails actually start on the main road up. So park at the main gate and start walking the length. I found many sites telling me trails started in different locations, none of which were accurate. The map offered there is a joke and extremely difficult to read. AND the trails start BEFORE you get to the maps.
The road goes all the way to the very top where you will find a parking lot and several picnic tables and probably teenagers smoking weed. There are also two spots with bathrooms. Actual bathrooms, not outhouses. There is a nice little butterfly garden near a pavilion. All in all, this place has a great view and would be an excellent place for a family gathering or a quick get away for a few hours.
Best advice is walk up the road, don't drive, or you will miss all of the trails.