IEEE SOSE 2015 is located in the San Francisco Bay area, close to many world famous attractions and stunning national parks and forests. Notable tourist attractions in downtown San Francisco include: Alcatraz, the Golden Gate Bridge, Fisherman's Wharf, Lombard Street, the Coit Tower, and Golden Gate Park (the De Young Museum, Japanese Tea Garden, etc.)
If you wish to travel out of town, you will be close to all manner of beautiful places. Consider visiting the Big Basin Redwoods State Park, Monterey Bay (for the world famous aquarium and the 17-mile drive), Carmel-by-the-Sea, and San Jose. Should you have more time, you can also consider driving south on the spectacular Pacific Coast Highway, which will take you on a beautiful drive down the shore of the pacific ocean, all the way to Los Angeles.
Some useful links to help you plan for your visit are given above.