Have found this indoor play area in Costa Adeje - it is on the top floor of the old shopping centre (Centro Commercial), next to the Costa Adeje Gran Hotel. Entrance is 5 euros per day for visitors, (4 for residents) for unlimited time - you can even go out and return later in the day. Its a great play area, especially if the weather isn't great, and very quiet, especially Mon - Fri. There's a large cafe area with plenty of seating. NB the children need to wear socks, or they will sell you a pair for 1 euro!