Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is San Jose (38% of total searches to Silicon Valley). The next most popular destinations are Fremont (27%) and Burlingame (23%). Searches for hotels in Sunnyvale (12%) are also popular.
KAYAK users have found double rooms in Silicon Valley for as cheap as $87 (San Jose) in the last 3 days. The average price is $386.