Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Cascais (90% of total searches to Sintra-Cascais Natural Park). The next most popular destinations are Sintra (8%) and Alcabideche (1%). Searches for hotels in Azenhas do Mar (1%) are also popular.
KAYAK users have found double rooms in Sintra-Cascais Natural Park for as cheap as €43 (Cascais) in the last 3 days. The average price is €258.