The ukulele is awesome -- and fun to play on its own. It has a sweet sound, is easy to carry around, and simpler to play with only four strings.
The charts included at the end here show how to play all the chords in any key.
But it's also worth mentioning that playing the uke is also a great way to learn the guitar. And that's because the ukulele and guitar share the same pattern.
The instruments are identical -- only the uke is just a portion of the guitar. Its smaller fretboard is just a subset of the guitar fretboard ... so the notes are the same:
This is why it's so useful to learn the ukulele. Because it packs a one-two punch -- as a cool instrument on its own, and as a gateway to mastering the guitar.
The two instruments aren't just similar ... they're not merely analogous. They are the same. So once you learn to play one, you've already learned the other.
And to help you jump into playing the uke, here are chord charts in every key....