Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Gramado (46% of total searches to Rio Grande do Sul). The next most popular destinations are Porto Alegre (45%) and Torres (4%). Searches for hotels in Canela (4%) are also popular.
KAYAK users have found double rooms in Rio Grande do Sul for as cheap as $8 (Caxias do Sul) in the last 3 days. The average price is $60.