Thanks for the recommendations, really appreciate it. My youngest will love the trams and the oceanarium. I've heard its very hilly there, is that the case? Part of me hopes it is as I'm in training for a charity trek in May and might take my walking boots and get in some training.
Take the tram up to the Castelo Sao Jorge and the Alfama - the local kids stick their hands out to touch the buildings they are so close.
Belem - the cloisters in the Monastery, the Antiga Confeiteira de Belém for Pasteis de Nata, the Tower and the Discovery Monument.
The Oceanarium in the Parque Des Nacoes will appeal to the little ones.
If you like art the Gulbenkian Collection is one of my favourites - it's a mini tour through Art with just one or two examples from each of the great artists from the 14th Century up to the Impressionists.
Agree you should visit Sintra if you have time, it's well worth it.
There are some nice beaches too along the coast - you can get the train to Cascais or Carcavelos. But the water is very cold. The coldest I've ever swum in.
I loved Lisbon. It is the friendliest capital city I have visited. Places to see: Belem - the tower and the convent (we went on the tram - no 15) National tile museum - far more interesting than it sounds as it is in an old convent The Alfama (old town) Botanical gardens Castelo de Sao Jorge Sintra - we went on the train
Apparently there is now an aquarium worth visiting (it wasn't built when we were there)