a must do is go to mexico. it's like a really big flea market [edited] on prices they have everything. also if you like spices try the street taco's there great blow's taco bell away by a million miles. the trolley will take you right to the border so you do not have to drive but you will have to walk.
I agree, Coronado is a splendid retreat. If you go, be sure to check out the Hotel del Coronado, it's gorgeous!