cycling in Portugal

Me and my boyfriend will travel to Portugal in March for about 2 weeks.
Do you have any suggestions of where to go by bike? We obviously want to go to Lisbon (as it is our first time in the country) and Sintra (as we've read wonders about the city) but apart from that we are open to suggestions.
We are interested in culture, beaches, nightlife and good food Has anyone cycled in Portugal that could give us some tips?

Hello Jennifer,
I´m from Portugal and near Lisbon you can find a lot of places to cycle. Try to explore Cascais, Mafra and Ericeira because it´s near Sintra.
In this places you can find all the things you asked.

Good journey,

Ricardo