I'm thinking of taking up a new music instrument over the summer. But I'm not sure what to play. Acoustic or electric guitar? And for that matter, what about drums?
(No ukelele.)

Start with acoustic guitar. After you've gained some experience with it, you might go onwards to electric.

Is there a difference? Like playing-wise? Are the differences significant?

Guitar? Drums?
Bah! BAGPIPES!

Just learn to play harmonica. :D

Skin Trumbone ?

Triangle?

Well, I was thinking starting out playing basic stuff, then moving on to maybe alternative rock stuff, and then maybe I'll join a band or something. It's all near-future stuff, of course.

(Rofls... Triangle)
I have always loved the Violin, but have been completely lacking in musical talent to play any instrument myself. I've had to stick to Synthesisers, Sequencers and Samples to make anything remotely musical.
I swear Keenan Weaver plays something, you should ask him.

I agree with sheepdragon. Start with an acoustic guitar, and get an electric one later on, if you get that far. If you do plan to play the electric guitar later on, then you may want the acoustic guitar to be a western guitar, rather than a Spanish one. The difference is, the bottom three strings on a Spanish guitar are nylon. On a western guitar they are metal, like on an electric guitar.

I reckon that most of your stuff will be played clean, or with some low gain overdrive or distortion, then? Most of that kinda music is usually chords, where the only problem can at times be finger position and such (depending on what kind of chords), in which case it probably won't matter much if you play acoustic or electric. I actually think it would be easier, since electric guitars have thinner necks, which makes playing these chords a lot easier.
EDIT:
@Wishbone:
Yeah, the problem for some is that they take a great wad of cash, buy the best thing they can find, and lose interest, or have problems learning it because of the shortcut. A cheap acoustic is the best way to start, even if you're just getting the basics in, so that you know that it will be something entertaining for you.
EDIT2:
@Wishbone below:
Yup, mine as well, but they seem to not as common as the fat necked nylon bastards. My first guitar, a child thingy with nylon strings which is rather tiny, actually have a fatter neck than my current one (Seagull S6). But, the problem with starting with metal strings only, is that with the lack of calluses on the finger, they might start digging in, which can be quite painful.

You can get thin neck acoustics too. Mine is.

As has been mentioned a few times already, if you're going to play guitar, it really doesn't hurt to go with acoustic first. There is such a thing as muscular memory and your fingers and hand will remember where to go after a while; It's then much easier to "step down" to a thinner necked electric than it would be to "step up" to a fatter necked acoustic.
I think this is only an issue initially though! After that, I guess it depends on what style you want to play and what you prefer! Guitar is so much fun to play, really man, good luck!
I don't know if you play anything already, but if it doesn't all come together right off the bat, stick with it! You'll be awesome in no time at all! :)

Aah man, no one is an expert before they start playing! (In terms of instruments) Music is something that I think is lying dormant in everyone! And all it takes is practice and application to unleash it! lol
I would really encourage you do go for it man! If Violin is your calling then that is too cool! I used to play as a kid and, well, it's a cool instrument!

I think it's that peehahnough thing. I think it's a South American instrument of some kind.