San Francisco Bay to Breakers n00b..

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So I'll be attending B2B in SF for the first time ever and I'm looking to run *at least* a portion of it. Is there anyone out there also attending for the first time? I'm going with a friend and we're both new to marathons.. also, we won't be dressing in funky costumes haha.. You think it would be silly if we run just a little bit and then WALK the rest of the way.. it's a 12k and I'm now getting nervous lmao. I can't back out!! :embarassed: