overtime is negated by additional travel costs and lost free time.
The middle one - it's higher paid, easy to get to.... not going to be as knackering, and also you don't have to worry about fucking peoples weddings up if you forget something, destroy something etc - more spare time.
That said the first could be a good laugh with some potential poon via weddings etc.....
Internships are worth it if they are with a heavy weight company. Otherwise it's essentially slave labour and you should be paid regardless.
Dub Post.... sorry - i didn't see the Internship was with Pepsi.
Was this hard to get? an apply / interview situation? If so - it could be worth it for the experience.
You should do the Internship - then get an evening job a few nights during the week.... at a bar / restaurant or something.... that way you get best of both worlds.