The cache is hidden at:
To solve the puzzle, visit the following locations and find what is indicated. While most of the items you are looking for are not on the multi-use trail, they can all be seen from the trail except for A - same as parking coordinates, and H - a few blocks beyond the west end of the trail.
A - N33 14.752 W117 17.981 - Month in which Buchanan park was dedicated
B - N33 14.387 W117 19.387 - Middle digit on the bottom of the San Luis Rey Trail historical marker sign
C - N33 14.381 W117 20.077 - First digit of the zip code on the plaque on the walk-over bridge
D - N33 13.440 W117 20.593 - Number of drive-in movie screens multiplied by two
E - N33 13.227 W117 20.928 - Number of white components in the segmented circle (not including the traffic pattern indicator) for Oceanside Municipal Airport. Check the photos if you are unsure of what to look for.
F - N33 12.407 W117 22.958 - Last digit on the call box on the North side of the nearby road
G - N33 12.299 W117 23.135 - Number of stripes on the sailboats sail in the mural
H - N33 11.814 W117 23.198 - Number of tall trees contained in the circle. Sit and watch the waves before you make your way back!
You can check your answers for this puzzle on Geochecker.com.