You can do a lot during the light day. For example, visit Badajoz or Porto.

Significantly, there is not even a point to compare the comparison. Tourists often visited Porto for 1 day, on the morning of leaving on an early train there, on the evening train back (2, 5 hours in one side). Trains run from the Oriente station. Porto can be reached by car on the highway and with an overnight stay, and without. There are also group excursions from Lisbon for the whole day (about 10 hours).

Take a walk in the old center, ride a river boat along the city, you will get beautiful photos. Visit the restaurant on the waterfront, walk around several cellars of Port Vine. In the evening, you can arrange shopping on the pedestrian street of Santa Catarina, because the north of Portugal is famous for its leather goods, shoes. Take a ride on the tram.