You have the beginnings of a good review and you write well, but reviews need loads more info - have a read of reviews that have been rated 'Very Helpful' and you'll get the idea! Also, your review is somewhat off-topic - it's meant to be a review of San Francisco, not California in general. Readers want to know about the sights in SF, what places you visited, where you stayed, etc. : ) by thereddragon