SAN FRANCISCO -- Beefed-up security in response to last month's Boston Marathon bombings didn't deter tens of thousands from reveling in San Francisco's most spirited footrace Sunday.

Berkeley resident Kenneth Prochnow, 62, ran his 28th Bay to Breakers wearing a "Boston Strong" T-shirt, one of many that could be spotted in the sea of colorful costumes and birthday suits.

"I wanted to show solidarity with folks in Boston," Prochnow said. "This is a country that looks to the future, and the terrorists are not going to win."

There were more than 30,000 registered participants -- slightly down from last year -- at this year's sun-soaked 102nd Bay to Breakers, and thousands more who joined in the fun without an official race bib.

Among the costumes were more than one naked Batman, dozens of people to answer the question "Where's Waldo?" and a Jamaican bobsled team. As usual, there were house parties up and down Fell Street, and bands entertained the masses throughout the 7.46-mile course. At the finish line at Ocean Beach, racers cooled off in the Pacific breakers for which the race is named.

Tolossa Gedefa Fufi, 21, of Ethiopia, was the fastest male runner this year, zipping through in 35 minutes and 1 second, according to race organizers. American Olympian Ryan Hall came in second with a time of 35 minutes and 40 seconds.

The first female runner to cross the finish line was Diane Nukuri-Johnson, of Burundi, who finished in 40 minutes and 12 seconds. The second-place female runner, Adrienne Herzong of the Netherlands, came in at 40 minutes and 42 seconds.

"Coming off of an eighth-place finish at the recent Boston Marathon, and placing second at the 2012 Bay to Breakers, I am thrilled to take first place at Bay to Breakers this year," Nukuri-Johnson said in a news release.

Though Boston was on many minds, people said the April 15 bombings that killed three and injured more than 260 did not make them hesitate to attend Bay to Breakers this year.

"I didn't give it a second thought," said spectator Molly Plath. The 33-year-old Oakland resident was at a Boston bar about a mile from the finish line when the bombs went off. Her fiance David Kyle finished the Boston Marathon more than an hour before chaos broke and was an early finisher at Bay to Breakers on Sunday.

"I think you can't let things like that terrify you to the point where you can't live your life or celebrate your city," Plath said.

Many runners said they were cognizant of the increased security presence. Professional triathlete Caroline Gregory, of Walnut Creek, said she had never before seen police escorts for the elite runners like herself. Regardless, she wasn't worried about terrorism.

"What are the chances?" Gregory said. "The chances were slim for one racing event, let alone two."

The San Francisco Police Department reported no major incidents at the race, or at the Amgen Tour of California professional cycling event, the final stage of which ¿started in San Francisco on Sunday. At 12:40 p.m., police reported 14 people being treated at the Police Department's so-called "sobering tents," and another 13 who had been taken to County Jail for public intoxication.

The eighth leg of the Amgen Tour of California, which started at Marina Green, also went off smoothly, according to Kristin Bachochin, the tour's executive director and the senior vice president of AEG Sports, which also owns Bay to Breakers.

"Overall safety is first and foremost with us," Bachochin said. "Regardless of what happened in Boston, people always need to be alert" at big public events.

Alcohol and ice chests have been banned for several years, but it didn't stop people from partaking at the event celebrated for its party atmosphere. But this year's ban on backpacks and large bags definitely restricted how much alcohol people could take along.

Members of the Walnut Creek Police Department bomb squad were among the bomb technicians from as far as Yolo County watching out for abandoned bags and other suspicious activity for the first time this year.

"There's an understanding in the bomb squad community that when something big like this going on, we have to come together," said Walnut Creek police reserve Capt. Chris Flath. "There's only 435 bomb squads in the country, so any big event, you really need to draw from mutual resources.

"It's been a lot of sitting around," Flath said.

Some veteran Bay to Breakers runners said there was something different about this year's race, besides the increased security, but they couldn't conclude exactly what.

"Seems like less people watching on the sidelines," said San Franciscan Steve Garza, with longtime friends from UC Davis dressed like 1950s milkmen, but wearing cow-printed Speedos instead of slacks. "There's always naked men, but not enough naked women."

Staff writer Elliott Almond contributed to this report. Contact Malaika Fraley at 925-234-1684. Follow her Twitter.com/malaikafraley.