I don't know the Islands but I do know mainland Spain well.
I'm a bit biased as my parents have been taking my brother and I to Spain since we were 2, they bought a flat there in 1984 and then we (me & them) bought a bungalow too in 2003. I go 2 to 4 times a year and will probably just miss you as I'm out for a fortnight from 7th October after my exams.
For mainland Spain I LOVE Denia on the Costa Blanca or Javea (pronounced Havea). Denia is utterly beautiful & there are a lot of holiday villas there but you still get a taste of the real Spain. Both are on the coast and for a family I would suggest getting a villa in an urbanization with a communal pool and hiring a car. In town you'd have the pool & the sea for swimming, the castle's lovely, tonnes of yummy restaurants, only 1 hour's drive from Alicante so cheap flights, (I always fly Monarch -
www.flymonarch.com), the Esplanade and the main tree-lined avenue or the harbour walks for late night walks, excellent shops. 1/2 hr drive to theme parks, Terra Mitica, Terra Natura safari park, Aqualandia water park, Mundomar dolphin world in Benidorm. (I wouldn't stay there as it's very either tacky or elderly & less safe in the evenings). Georgia would be able to meet other kids playing in the pool etc. or on the beach like we used to do when we were kids & there's enough culture/entertainment/beautiful scenery to keep anyone occupied! (I met a particular mix of Spanish & English kids when I was 16 & I still see them most summers even though I'm 28 now! Wow! Except we don't play "What's the time Mr Wolf?" & swim now we go to the bars!) Also the ferry runs from there to Ibiza & Formentera. Fiestas main one is Santisima Sangre, patronal festival of town, 2nd weekend in July to 3rd weekend in July and Moors & Christians parade is 14th to 16th August. The July one is stunning. Tourist office has brochures; week long competitions, bull running along the main street & playing at the harbour, paella making competitions, dancing, parades etc. (No bull fighting - I'm veggie! but they have loads of people standing along the side of the harbour in an arena with people in stands watching & as the bull runs along they tease it & then fall/jump in the sea!)
DÉNIA TOURIST WEB
|| Terra Mítica ||
Aqualandia v2.0
Denia Costa Blanca Spain by Costa-Blanca-Denia.to
BBC - Holiday - Destinations - Javea
The first website is the tourist board, the 2nd is Terra Mitica, 3rd Aqualandia, 4th just a general Denia site, 5th Javea (Just as beautiful but my heart belongs to Denia!)
Hope this completely biased view helps!!!!!!!
Love xxx