Use this D6 instead
D6(4220)
You need to tune your ukulele one and a half steps up
or (as I do) use a capo on the 3rd fret to play it in the original tone!
Also, I like to change sometimes from C7 to C, experiment a little
Am C7 F D6 E7
Sunny, yesterday my life was filled with rain,
Am C7 F D6 E7
Sunny, you smiled at me and really eased the pain.
Am C7
The dark days are done and the bright days are here,
F B D6 E7 Am G F E7
my sunny one shines so sincere, Sunny, one so true, I love you.
Am C7 F D6 E7
Sunny, thank you for the sunshine bouquet,
Am C7 F D6 E7
Sunny, thank you for the love you brought my way.
Am C7
You gave to me your one and all,
F B D6 E7 Am G F E7
and now I feel ten feet tall. Sunny, one so true, I love you.
A#m C#7 F# D#6 F7
Sunny, thank you for the truth you let me see,
A#m C#7 F# D#6 F7
Sunny, thank you for the facts from A to Z.
A#m C#7
My life was torn like-a windblown sand, then
F# C D#6 F7 A#m G# F# F7
a rock was formed when we held hands.Sunny, one so true, I love you.
A#m C#7 F# D#6 F7
Sunny
A#m C#7 F# D#6 F7
A#m C#7 F# C D#6 F 
A#m G# F# F7
Bm D7 G E6 F#7
Sunny, thank you for that smile upon your face,
Bm D7 G E6 F#7
Sunny, thank you for that gleam that flows from grace.
Bm D7
You're my spark of nature's fire,
G C# E6 F#7 Bm A G F#7
you're my sweet complete desire, Sunny, one so true, I love you.
Bm A G F#7
I love you 
Bm A G F#7 ...
I love you
Source: www.ukulele-tabs.com