REAL TRAIL DETAILS+MAPS+UPDATED PARKING COSTS:
The Flat Rock Beach trail in total (including Yucca Point Razor Point and to the actual beach) is 2-2.5 miles according to all trails and my watch
The trail starts with dirt flooring and quickly progresses to just stepping on Sand. It goes progressively downhill from the trailhead and is extremely manageable (remember you have to go up on the way back!!). It only gets more steep+ a lot of semi-uneven stairs at the actual beach portion of the trail. This portion is fairly safe (only 1-2 points where you have to calculate your steps) and really just requires endurance (wanna emphasize theres a lot of stairs). Note:at high tide the beach itself is non-existant and they don't reccomend going.
There is very little shade and very few Torrey pines on this trail. The sun (even in beautiful coastal San Diego) can make it so you can go through a lot of water so bring plenty (I drank 3 pint bottles and I grew up in the area)
Despite there being very little Torrey pines the views (especially at the viewpoints and as you progress near the sandstone slopes) are absolutely gorgeous (Ill include some photos, we spent a bunch of time on them)
NOTE:parking at 4 PM was available on the top lots near the visitor center (each lot had enough parking to where we could choose where we wanted to go). The bottom lots near the beach were a slaughter fest.
PARKING COSTS ARE NOW $20 PER VEHICLE (no longer $15)
Overall:it is a nice trail to bring the family on and give them a challenge. Its not "super crazy or exciting" but it has its highlights. The trail wasn't overloaded with people (we'd see people pass by every 2-4 minutes) and was really nice. If you want a more niche trail with similar views to yourself (and free!!), consider the extension reserve down the road
Safety summary for Flat Rock Beach trail:
There is some cactus off to the side of the trail but none of it comes close to touching people
There are some points beyond the railing that can be deemed unsafe but just use common sense
And there is always a chance of rattlesnakes but quite frankly they aren't the mosr common and don't wanna see you
You will not see mountain lions, bears, or any other animal that poses an imminent threat
Native Plant List for Geeks (winter and spring is best-->in socal everythings dead in the summer and fall):
Torrey Pines (some near Razor side of the trail), Chamise, California Sagebrush, California Buckwheat, Black Sage, Coastal Goldenbush, Mojave Yucca, Lemonade Berry, Pink Sand Verbana, Berry Saltbush, three dudleya species (Fingertips, Lanceleaf and Chalk), four species of opuntia (cactus), Del Mar Aster (California), a long with smaller amounts of Mission Manzanita, San Diego Barrel Cactus, Del Mar Manzanita, Bushrue, Red Bush Monkeyflower, and more