So thought I'd give this a go, feel free to correct etc.

Note: my guitar is tuned half a step down but I've set the tuning accordingly.


G#                                 C#            G#
I wanna marry a lighthouse keeper, and keep him company
G#                                Bb               Eb
I wanna marry a lighthouse keeper, and live by the side of the sea
G#                           G#7
I'll polish his lamps by the light of day
C#                    C#7 (or C#m)
So ships at night can find their way
G#                              Bb  C#7  Eb7     G#
I wanna marry a lighthouse keeper, won't that be okay?


C#m                                     G#
We'll take walks along the moonlit bay, maybe find treasure too
C#m                            Bb         Eb
I'd love living in a lighthouse, how bout you?


G#                                      C#           G#
I dream of living in a lighthouse baby, every single day
G#                               Bb                    Eb
I dream of living in a lighthouse, the white one by the bay
G#                        G#7
So if you want to make my dreams come true
C#                     C#7/m
You'll be a lighthouse keeper too
G#                           Bb    C#7   Eb7        G#    F
We could live in a lighthouse, the white one by the bay
C#7    Eb7      G#    F
Won't that be okay?

C#7   Eb7    G#


Peace