(My first addition to Ultimate-Guitar Tab)
Chords in brief:
Intro: E (022100@1)F (133211@1)  G (320003@1) F (133211@1)  Ex4 (022100@1)Verse: A  F#m  E   x6
       D (xx0232@1)Bm (x24432@1) D (xx0232@1) Bm (x24432@1) D (xx0232@1) E (022100@1) 
       A (x02220@1) F#m (244222@1) E (022100@1)Song in more detail:
Firstly, this is just an acoustic approximation of the song. Just the best way that I 
have found to play it on a solo acoustic guitar. There are some 2nd guitar bits
in the second verse that are lovely and if you have a loop recorder you might fancy 
going off on them whilst the melody continues, but I don't have a loop recorder so
I didn't bother working them out. The end bit, where they go off on one about 
enchiladas, is a bit weird and ends with a fadeout which doesn't really work on a solo
acoustic. I made up my own way of playing it. Totally different, but it works much 
better in the absence of production.
Please remember: this is never going to sound exactly like the recording but it's the 
best way I've found to play it on a solo acoustic.
Play around with it, make it your own interpretation.

Standard tuning.

INTRO: Use your thumb to strum rapidly, but softly, up and down to create a tremulo 
effect. Slide your left hand between the chords for the intro. Sounds crazy, but I
prefer it without barring the chords.
    E (022100@1) F (133211@1) G (320003@1) F (133211@1) E (022100@1)      (repeat x4)
e---0---0---0---0---0----------|
B---0---0---0---0---0----------|
G---1---2---4---2---1----------|
D---2---3---5---3---2----------|
A---2---3---5---3---2----------|
E---0---0---0---0---0-0--0-0-0-|

Whilst strumming the E you might like to use your left hand thumb to play the low 
e-string (it kinda subsititutes for that bass/thump noise you can hear in the original recording).

VERSE: Play the "A" as the higher bar chord and, just before you transfer to the F#m, 
use your little finger to fret on and off the high e-string 7th fret (you'll work it out).
    A (x02220@1)        F#m (244222@1) Ee---5---7-7--5--2----0-------| (022100@1)B---5-----------2----0-------|
G---6-----------2----1-------|
D---7-----------4----2-------|
A---7-----------4----2-------|
E---5-----------2----0-------|

A (x02220@1)     F#m (244222@1)E (022100@1) A (x02220@1)            F#m (244222@1)ETake (022100@1)me down  to where you hide,
A (x02220@1)    F#m (244222@1) E (022100@1)     A (x02220@1)         F#m (244222@1)ELay (022100@1)me down,  lay me down inside,
A (x02220@1)      F#m (244222@1)E (022100@1)    A (x02220@1)                   F#m (244222@1)EWhat (022100@1)use now?  Roll back this Pacific tide.
D (xx0232@1)                       BmTijuana (x24432@1)Lady where did you go?  Yeah,
       D (xx0232@1)                        BmI (x24432@1)been chasing you around ol' Mejico, yeah,
     D (xx0232@1)       E (022100@1)              AGonna (x02220@1)find my way back to San Diego.
                 F#m (244222@1) E (022100@1)    A (x02220@1)     F#m (244222@1)    EBaby (022100@1)where'd you hide?

A (x02220@1)     F#m (244222@1)E (022100@1) A (x02220@1)            F#m (244222@1)ETake (022100@1)me down  to where you hide,
A (x02220@1)      F#m (244222@1)  E (022100@1)     A (x02220@1)        F#m (244222@1)EPlay (022100@1)me around,  lay me up inside,
      A (x02220@1)     F#m (244222@1) E (022100@1)   A (x02220@1)          F#m (244222@1)name="chord_022100@1">E
Don't make no sound coz I know you lie,
D (xx0232@1)                         Bm (x24432@1) ETijuana (022100@1)Lady let's take it slow, yeah well I..
D (xx0232@1)                        Bm (x24432@1) E (022100@1) Know that I'm no head honcho, but I...
D (xx0232@1)             E (022100@1)               A (x02220@1)  F#m (244222@1) E (022100@1) A (x02220@1)F#m (244222@1) E (022100@1) I'll keep you warm in my silky poncho

INSTRUMENTAL BIT (I play it like as follows but you can just leave it
out for simplicity)

A (x02220@1)   C#/C#m Bm (x24432@1)   EA (022100@1)    F#/F#m (on 9th fret)  E

D (xx0232@1)                        Bm (x24432@1) E (022100@1)Tijuana Lady where did you go?  yeah well I...
D (xx0232@1)                           Bm (x24432@1)I heard you lost your last sombrero,
D (xx0232@1)                           Bm (x24432@1) E (022100@1)Tijuana Lady which way'd'you flow? I'm a..
D (xx0232@1)     E (022100@1)        A (x02220@1)El Mariachi Desperado,
                    F#m (244222@1) ETell (022100@1)me where'd you hide,
A (x02220@1)                   F#m (244222@1) E (022100@1)  Tell me where'd you hide.

[Now, either finish with another lovely D Bm chorusy type bit eg:
D (xx0232@1)                       BmTijuana (x24432@1)Lady where did you go?  Yeah,
       D (xx0232@1)                        BmI (x24432@1)been chasing you around ol' Mejico, yeah,
D (xx0232@1)                         Bm (x24432@1) ETijuana (022100@1)Lady let's take it slow, yeah well I..
D (xx0232@1)             E (022100@1)               A (x02220@1) I'll keep you warm in my silky poncho.

OR....
try out my interpretation of the weird enchilda bit:]

A (x02220@1)                  F#m (244222@1)E (022100@1)Em... (022000@1) Tell me where'd you hide?
Em (022000@1)                    B (x2444x@1)    Enchilda Desperado day,
Em (022000@1)                            BSenorita (x2444x@1)come back and meet me again,
Em (022000@1)                  BBuena (x2444x@1)vista senorita hey,
  Am (x02210@1)        F (133211@1)                D (xx0232@1)               AI (x02220@1)love you so come back, be with meeeeeeee        again.

[tabbed by Tim Harcourt]