Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Lagos (78% of total searches to Southwest Alentejo and Vicentine Coast Natural Park). The next most popular destinations are Sagres (9%) and Odeceixe (8%). Searches for hotels in Sines (5%) are also popular.
KAYAK users have found double rooms in Southwest Alentejo and Vicentine Coast Natural Park for as cheap as $20 (Lagos) in the last 3 days. The average price is $196.