Hi we went to Salou in Spain last September with 15 year old twins and 12 year old twins and had a great time, there is theme park that caters for all ages and a waterpark right next door something for everyone. I would not recommend where we stayed it was fine for teenagers but not for little ones as there was not a lot to do, but I am sure you cuold find a hotel or apartment easy enough. We were at the Michaelangelo Apartments.
I'm sure you will find somewhere, try the travel section on this.
good luck, we're going to Benidrom this year since it has a theme and water park and we wanted a change.