If the weather's taken a turn for the worse, why not head to Museu dos Fósforos? You'll be fascinated by just how much you can learn about days gone by here.
You'll soon find out why this Tomar collection of historical artifacts is a hit with travelers. If you're looking for more to see and do here, Convento de Cristo, Synagogue of Tomar, and Praca da Republica are in the area as well. They won't take you long to reach from Museu dos Fósforos.