The “Park E Bike” service provided by Cycling Rentals makes it possible for any visitor to stroll around the Hills on an electric assisted bicycle without much physical effort. The partnership with Parques de Sintra makes it possible to rent a bicycle and combine with tickets for the parks and monuments.
Futher information here
This service is recommended by Parques de Sintra, but provided by a partner. Cycling Rentals is responsible for its managment and for providing all information.