San Francisco is gearing up to host a diverse set of events this weekend, which is expected to attract one million people to the city.
But for those thinking of attending, transit officials are advising people to plan ahead and leave their cars at home.
The Giants will kick off their playoff run starting Saturday, but the city also has Fleet Week, parades, concerts and other events expected to bring traffic to a standstill.
Elvis Costello performed for thousands of people in Golden Gate Park Friday, ending the first day of the Hardly Strictly Bluegrass Festival.
"It's a huge event, but it's been really mellow," said Maritzia Zilles of San Francisco.
Traffic will be anything but mellow for the music festival, America's Cup races, the Italian Heritage Parade, the Castro Street Fair and the Giants playoff games.
"If anything, I'll probably take public transportation," said Cara Scott of San Francisco. "It's just the easiest way to go."
San Francisco police and transportation officials are recommending people don't drive into the city.
Extra BART cars, buses, ferries and taxis are being put into service for the weekend.
Some roads will be blocked off, including several streets around Golden Gate Park, and all but one of the northbound lanes of the Embarcadero.
"I know it's convenient to drive into the city but once you get into the city you may find that it's not as convenient (as) if you were taking public transportation," said San Francisco police officer Carlos Manfredi.
Boats are also expected to crowd the bay, which has wildlife officials concerned.
A humpback whale was spotted by Newschopper Two on Monday near the Golden Gate Bridge and Alcatraz.
The National Oceanic and Atmospheric Administration is warning people on the water to watch out for marine mammals.
"The federal guidelines for close approach are you should not come any closer than 300 feet, and that's about the length of a football field," said Mary Jane Schramm of NOAA's Gulf of the Farallones sanctuary.
Coast Guard officials said they will be monitoring the bay, looking for any safety violations.
Officials said they also say some parts of the bay will be restricted to the public because of Fleet Week and the America's Cup festivities.
Watchdogs are questioning an exclusive agreement between the City of Oakland and a non-profit group, tapped to lead a multi-million dollar project to redevelop the area around the Coliseum BART station.
The rare Cloud Forest is at peak bloom for this year at San Francisco Botanical Garden. The San Francisco Botanical Garden is one of the only outdoor botanical gardens in the world where the alluring beauties of the world’s misty cloud forests thrive and right now its prized Cloud Forest Garden is at its peak bloom for this year.