Where is Valencia, other than Spain?
If the Six Flags there is anything like the New England one, and you like rollercoasters, you are in for a treat.
Eat a light breakfast.
Valencia is North of LA near Santa Clarita.
Six Flags Magic Mountain is (or was) the Theme Park with the most Roller Coasters of any park in the world. So Yes we like roller coasters.
We have (on this trip) been to the Santa Cruz Boardwalk & Knotts Berry Farm, and after tomorrow we are also going to Six Flags Discovery Kingdom (in Vallejo).