The cache is placed in SE Yuba City. You can drive right to it after solving the puzzle below.
1. State situated between Sonora and Coahuila
2. country across the southern border of Chiapas (-1)
3. the pyramid of Kukulcan is here (second word)
4. Chetumal is the capital of this State (2nd word, last letter)
5. As above (second word, next to last letter)
6. resort town at NE end of the Yucatan Peninsula
7. well-known Tijuana trumpet player (first name, +1)
8. largest town in the municipalityof Tecamac
9. Festive Mexican holiday in the Spring of the year
10. he used a native woman, La Malinche, as interpreter and guide (his 1st name)
11. the river which borders Mexico and Texas (second word, -1)
12. he was President of Mexico during the 1860s (minus one)
13. fierce tribe who settled Mexico Valley in the 13th century
14. the State located immediately south of San Diego, Calfornia
15. it is known as the "City of Eternal Spring" (last letter)