Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Porto Alegre (76% of total searches to Rio Grande do Sul). The next most popular destinations are Gramado (16%) and Passo Fundo (4%). Searches for hotels in Erechim (4%) are also popular.
KAYAK users have found double rooms in Rio Grande do Sul for as cheap as £11 (Pelotas) in the last 3 days. The average price is £50.