The verses are just D A D A ... as many as needed  with the change
occurring on every second bar. There is an additional two bars of D
at the start as well.
The way to play it is something like this:
     
 D.   .   .   .     .   .   .   .     D.   .   .   .     .   .   .   .
|-----------------|-----------------||-----------------|-----------------|
|-3-----3---------|-----------------||-3-----3---------|-------------3---|
|-2---2-2---2-2-2-|-2-2-2-2-2-2-----||-2---2-2---2-2-2-|-2-2-2-2-2-2-2---|
|-0---0-0---0-0-0-|-0-0-0-0-0-0-0---||-0---0-0---0-0-0-|-0-0-0-0-0-0-0---|
|-----------------|-------------0---||-----------------|-----------------|
|-----------------|-----------------||-----------------|-----------------|
 A.   .   .   .     .   .   .   .
|-----------------|-----------------||
|-----------------|-----------------||  repeat last 4 bars throughout
|-2-----2---------|-------------2---||  verses.
|-2---2-2---2-2-2-|-2-2-2-2-2-2-2---||
|-0---0-0---0-0-0-|-0-0-0-0-0-0-0---||
|-----------------|-----------------||
 The dots show the beat.
Use moderate amounts of overdrive, and mute the 2's with your palm to get
the distinctive percussive sound.               0

The Chorus chords are |Bm|A|D|G|Bm|A|D|G|Bm|A| (I use B instead of Bm)
use standard open A,D, and G and a barred A shape for B. 

The keyboard riff is sort of an arpegiated D and A ie.
 D                                    A
|-0-----2-----3---|---2-----0---2---|-----------------|------------------| 
|---3-----3-----3-|-----3-----------|-0-----2-----3---|---2-----0----2---|
|-----2-----2-----|-2-----2---2---2-|---2-----2-----3-|-----2------------|
|-----------------|-----------------|-----2-----2-----|-2-----2----2---2-|
|-----------------|-----------------|-----------------|------------------|
|-----------------|-----------------|-----------------|------------------|

This sounds a bit messy with overdrive, so play it clean, or (even easier)
just play the melody part (which is mainly what you hear on the CD anyway)

e|-0-----2-----3---|---2-----0---2---|-----------------|------------------|
b|-----------------|-----------------|-0-----2-----3---|---2-----0---2----|

For the key change after the second chorus, the chords are:
|F|Bb|C|Bb|F|Bb|C|C|  again use the barred A shape for Bb and C.
That's about all for Summer of '69#

Date: Tue, 13 Jan 1998 21:16:52 +0000 (GMT)
From: Jonathan Nott 
Subject: Chords: Summer of '69 UNPLUGGED by Bryan Adams
 (summer_of_69_unplugged.crd)

Summer of '69 - Bryan Adams (as played on 'Unplugged')
Transcribed by Jon Nott 

  D* is the progression: Dsus - D - Dsus4 - D - Dsus - D (arpeggiated)

  A* is the progression: Asus - A - Asus4 - A - Asus - A (arpeggiated)

Intro: D* A* D* A*

D*                               A*
  i got my first real six string - brought it at the five & dime
D*                              A*
  played it til my fingers bled - was the summer of '69
D*                            A*
  me and some guys from school had a band and we tried real hard
D*                                A*
  jimmy quit and jody got married - shoulda known we'd never get far

Bm          A              D                      G
  oh when i look back now - that summer seemed to last for ever
Bm         A               D              G
  and if i had the choice - ya i'd always wanna be there
Bm               A               D*   A*
  those were the best days of my life

D*                         A*
  ain't no use complaining - when ya gotta job to do
D*                                       A*
  spent my evenings down at the drive in - and that's when i met you - ya
Bm                 A              D                       G
  standing on your mamma's porch - you told me that you'd wait forever
Bm           A               D                   G
  and when i held your hand - i knew that it was now or never
Bm               A               D*   A*                       D*  A*
  those were the best days of my life - back in the summer of '69

F             Bb
  man we were killin' time
          C                       Bb
  we were young and reckless - we needed to unwind
F         Bb                  C
  i guess nothing can last forever...

  D* A* D* A*

D*
  and now the times are changin'
A*
  look at everything that's come and gone
D*
  sometimes when i play my old six string
A*
  i think about you wonder what went wrong

Bm                 A              D                 G
  standing on your manna's porch - you told me it'd last forever
Bm           A               D                   G
  and when i held your hand - i knew that it was now or never
Bm               A                    D* A*                       D*  A*
  those were the best days of my life -    back in the summer of '69

     continue on D* A*

Chords:

Bm     - x24432
A      - x02220
G      - 320033 or 320003
D      - xx0232
F      - 133211
Bb     - x13331
C      - x32010