Bioparc - huge open air zoo with lots of animals and play areas -
Oceanographic - aquarium spread over a large area with dolphin shows, sharks, whales, fish and other marine creatures.
Science Museum at the City of Arts and Sciences - science Museum with lots of hands on experiments ideal for kids plus a dedicated play and experimental area for small children
Gulliver Park and a walk along the Turia Riverbed - there are also family bikes (sort of a rickshaw with seats up front for the kiddies) which are fun with kids and there are a series of playgrounds and swings in the area.
Museum of Natural Science - small museum with fossils and dinosaurs housed in a garden.
and art museums.
Getting around by taxi (maximum 4 people) is cheap and convenient. The Metro and buses are also cheap and easy to use. I do not suggest buying a tourist card.
La Tagliatella at the Aqua centre (near the oceanographic) - we think that they have the best pizza!
Near the Valencia Cathedral there is a very nice cafeteria Valore 1816 and they serve good coffee and churros!
A very good restaurant Creperie bretonne annaick which is quirky and you are given crayons to draw with on the table mat. there are also doodles on the walls. The kitchen is housed in a bus...and most of all food was good and not expensive.
Thanks to Victoria Farrugia Galea, Nadia Schembri and Tanya Camilleri Haber for the helpful advice.