I have not done a lot of research yet. Porto is a historic city, which always draws me. It is supposed to be beautiful. Other than hat i am just trying to figure out what to do if I run out of things in Lisbon.
Much as I loved my time in Porto...it's NOT a day trip. Much too much to do there, including evening stroll along the Douro, port-wine tasting across the river in Vila Nova de Gaia and more. I'd say take the advice above and save Porto for another trip.
Of the recommended day trips above, I'd vote for Sintra. It's an easy trip--trains run about every 30 minutes, more frequently in rush hours, The town itself is interesting, the Moorish Castle up on the mountain and the Pena Palace above that are worth the trip (there's a bus...you don't need to be a mountain climber).
Check those two out in our Picture of the Day collections, by the way.
And, while Lisbon's beauty and hill-climbing may take your breath away--you will NOT run out of things to do! Including a perfectly lovely lunch opportunity on the other side of the river (Gumbo Blog).
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