Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Interlaken (97% of total searches to Lake Thun). The next most popular destinations are Ringgenberg (2%) and Spiez (2%). Searches for hotels in Beatenberg (0%) are also popular.
KAYAK users have found double rooms in Lake Thun for as cheap as $228 (Interlaken) in the last 3 days. The average price is $715.