If you want an authentic economic and tourist-free experience, take the catamaran from Cais do Sodre to Seixal on the south bank of the Tejo estuary. It's cheap and fast.
When you get there, walk for about ten minutes past the shipyard and into old Seixal. There are numerous places to eat the little snails (Caracois) or slices of cuttlefish (Chocos) washed down with a couple of glasses of beer. The cheapest and best however, is the headquarters of the local communist party, which is friendly and open to all!
Take in the traditional boats that used to work the river and maybe the old cork factory just up the road. If you are desperate for internet contact there is free broadband and wireless access in the local library.
The many ferries crossing the mouth of the Tagus are very relaxing and offer both excellent views and great tanning possibilities. I tried the one from Praça do Comércio to the South bank and back and the one from Belém which is a convenient way of getting to the Caparica beach just round the corner from landing.
Along the waterfront - various places.
Take the commuter ferry for the short trip across the Tejo river to Cacilhas (€0.60). Take a trip up the Elevador Panorâmico da Boca do Vento, a lift built into the cliff face (€1). Go at dusk when it is quiet and you can enjoy views of the sun setting behind the Ponte 25 de Abril and the Cristo Rei (a smaller version of Rio’s Christ statue).
Ferries from Estação Fluvial and Cais do Sodré
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