Hi!
Im Spanish from Valencia, if you have any doubt of the parks i will try to help you.
There's 4 big theme Parks in Spain, i have been only in 3 of them (lots of times) and i recommend you too visit!
- Warner Bros. Park- Madrid
http://www.warnerbrospark.com/
Nice themed and a very good 4 coasters.
- Port Aventura - Tarragona (Salou), Cataluña
http://www.portaventura.com/
This is a Universal park, for me is the park with more quallity and care for visitors in Spain, you will notice it in every detail.
My favorite Rides: Dragon Khan (B&M - 8 looping), Stampida (Race Woodie with two parallel tracks), Huracan Condor (100 meters free fall), and Templo del fuego (fire show).
- Terra Mítica - Alicante (benidorm)
http://www.terramiticapark.com
Very nice themed park with two coasters, 1 woody and 1 SLC, very nice views from the park over benidorm and the sea.
- Isla Magica - Sevilla
I have been never here.
Hope you have fun in Spain