The trail shown is the LST trail, which is roughly a half mile. There are some neat little landmarks. Kids like to wade/swim here as it's not too deep.

The main trail which starts at the first parking lot is just over 5 miles and is bi-directional. Hikers walk one way and bicyclists go the opposite way. The direction is switched monthly. The big arrow in the parking lot show the current direction for that month.

If you're hiking and get tired, there are several opportunities to get off the trail and cut back to the parking lot. Just study/take pics of the map and you'll do fine.