Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Lisbon (97% of total searches to Tagus River). The next most popular destinations are Cascais (3%) and Carcavelos (0%). Searches for hotels in Cacilhas (0%) are also popular.
KAYAK users have found double rooms in Tagus River for as cheap as $21 (Lisbon) in the last 3 days. The average price is $189.