The Aquapark is a must if the weather is good (and it usually is). There are loads of slides, and the dolphin show is worth the admission.
Mount Teide is a sight worth seeing. The half-day trip includes a cable car ride, but they only go on this if the queue is not too long, as they need to get to a restaurant in time. The cable car was not working anyway, as it was frozen!!
We were advised to go on the full-day tour (the Island tour); this starts in Candelaria, where you visit the basillica and see Guanche Kings statues and the famous Black Virgin Madonna statue, Patron Saint of the Canary Island. You continue to Santa Cruz, the capital, and then up to Puerto de la Cruz, pausing for a couple of hours in each. And finally, there's the highlight of the trip, Mount Teide, the highest dormant volcano in Europe (12,200 feet). You pass through the spectacular lunar landscape inside the Caldera de Las CaÑadas, where Star Wars, Planet of the Apes, and The Ten Commandments were filmed.
El Molino Blanco is one of the best restaurants in the area. Make sure you book, though, as it is very popular with the locals: http://www.canary-guide.com/tf/el-molino-blanco/.
${QuickSuggestions} Book transport from the airport before you arrive to avoid standing in a long taxi queue.
I would recommend the restaurant El Molino Blanco, but you must book in advance: http://www.canary-guide.com/tf/el-molino-blanco/.
${BestWay} We walked most of the time, but taxis are relatively cheap.
Our resort 'The Regency at Paradise Court' offered a shuttle bus to various local drop-off points, which was very good - ask at reception for times/locations.