There are so many rides that to experience Disney and California adventure you need the 3 day tickets. You don't necessarily need park hoppers but you can because C.A. can be done in about half a day depending on when you go. Make sure it's a time when there are no school breaks, spring or fall...etc. I usually go to Disney the first day, c.a. the second day, then go to the beach, then Disney the third day. Have fun.
About 26 at Disneyland and about 18 at California Adventure
i don't know, but there is many atractions, i recomended
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