Got given my uke in the Summer - hardly touched my guitar since.
My uke (a cheapo maholo, in lovely bright red) is great because:
A) it's FUN
B) you can take it everywhere (and I always do)
C) It's cheap, so if you annoy someone and they break it, it don't matter (actually it does, cos once it's been throroughly played in, it holds its tune a whole lot more)
D) you put it on the passenger seat of your car, and if you get stuck in traffic, well ukulele away!
E) Every time you hear a song, you start thinking "That'd be great fun on the Ukulele" (most of the time you're right)
F) Mine is lovingly decorated with a Weston-Super-Mare sticker.
As my brother put it (who gave me my uke) going back to a guitar afterwards feels like sitting behind a sideboard.
U-L-L