SUNLIT + LUPINE + HOME = NILUPON
Solve the cryptarithm; substitute the letters.
The cache is at N 37° 2I.UNL W 122° 0H.TPS.
Note that that is the letter "I" after the 2 and that is the number zero before the "H".
The cache contains an assortment of small erector set type parts. There is a pencil but it would be better for you to bring your own pen. There are three valid mathematical solutions. Only two produce coordinates that are possible; the correct solution should be obvious both from a geographical perspective and from the arrangement of the letters. The container is large enough for small items only.
You can check your answers for this puzzle on Geochecker.com.