I use the chords here, C7 optional or at least use it once (i.e. swapped with a C, or C then C7) for flair:
http://www.ukulelestrummers.com/Songbook/Whitesandybeach.html
From what I can tell, he's just plucking the strings downwards (4-3-2-1) and throwing in a slide on the G string (at the end of the F above "hawai'i"), then planting his pinky down on the A string, same fret. Whether he goes down one fret or two is hard to tell, I don't have a uke nearby to confirm but I'm leaning towards one fret. The flair at the end he's just using the 5th, 3rd, and 0th frets on the A string.. that's actually a tricky bit of hand/eye co-ordination, so build up to that one. He does gently hammer the odd note here and there to keep it interesting, but it's not entirely necessary, the base chords are good enough. He also does this nice little skip into F that I'd like to figure out, I think he's hammering into the chord...
The other thing to keep in mind is he's playing Low-G. Either way, when I play this song on standard tuning, the only problem I have with the 4-3-2-1 pluck is that the C string starts to stand out. Iz has the same problem if you listen, but he breaks it up with the flair.
Hope that's some help
/edit: It's a slightly different progression with the same chords, but you can get a good feel for the song by playing along with this
http://www.youtube.com/watch?v=RS43EP1EXz4
