This is the way I play this song (It is modified from the first version posted by
 I thought the E chord in the bridge of the other version sounded really weird (and I like the 
of the B7 rather than the Bm a little better in the verse/chorus), so I changed them.

Intro:
G (320003@1)Verse:


Em (022000@1)      C (x32010@1)     G (320003@1)       DIf (xx0232@1)you're going to San Francisco,

Em (022000@1)       C (x32010@1)      G (320003@1)              DBe (xx0232@1)sure to wear some flowers in your hair,

Em (022000@1)      G (320003@1)      C (x32010@1)      GIf (320003@1)you're going to San Francisco,

Em (022000@1)         B7 (x21202@1)      C (x32010@1)           DYou're (xx0232@1)gonna meet some gentle people there.

Chorus:


Em (022000@1)      C (x32010@1)     G (320003@1)       DFor (xx0232@1)those who come to San Francisco,

Em (022000@1)       C (x32010@1)      G (320003@1)        DSummertime (xx0232@1)will be a love-in there,

Em (022000@1)      G (320003@1)      C (x32010@1)      GIn (320003@1)the streets of San Francisco,

Em (022000@1)   B7 (x21202@1)        C (x32010@1)              DGentle (xx0232@1)people with flowers in their hair.

Bridge:


F (133211@1)            DmAll (xx0231@1)across the nations,

F (133211@1)            DmSuch (xx0231@1)a strange vibration,

GPeople (320003@1)in motion,

F (133211@1)             DmThere's (xx0231@1)a whole generation,

F (133211@1)        DmWith (xx0231@1)a new explanation,

GPeople (320003@1)in motion,

DPeople (xx0232@1)in motion,


End: Repeat chorus


For those who come to San Francisco
Be sure to wear some flowers in your hair
If you come to San Francisco
Summertime will be a love-in there

A (x02220@1)    C#m (x13321@4)   D (xx0232@1)     AIf (x02220@1)you come to San Francisco

A (x02220@1)   C#m (x13321@4)          E7 (020130@1)    ASummertime (x02220@1)will be a love-in there