Choose as good a hotel as you can - thanks to the boiling heat (which I personally cannot deal with), I found myself going indoors to seek shade and I wouldn't want to do that in a hovel.
If a drunk guy on the beach offers you a weird-coloured Calipo, don't take it.
Don't bother going out before midnight - use these hours for something useful, like napping.
Having said that, avoid confrontations immediately after naps. They will become explosions.
In light of this, stick to the golden rule - What Happens In Maga, Stays In Maga. *
* This rule applies to embarrassing emotional outbursts and / or horrible, drink-fuelled and stress-related arguments. These will happen, but it's best to forgive and forget. The hilarious, 'she-got-with-a-minger' stories on the other hand, are gloriously exempt from this rule.
Don't wear heels. Don't even bother packing them.
STICK TOGETHER.
Frequent ice-cream breaks help keep everything and everyone sweet.
Avoid usual bodycon-town dresses - a) you'll boil, b) you'll boil, c) nobody wears them. Think vest tops and denim shorts.
Likewise, take clothes you won't mind getting drink spilt on. Inevitable.
If a guy says, 'I'm not trying to pull you', he's trying to pull you.
Stock up on magazines / books - life poolside can be pretty, er, relaxing. Plus even though heat is available all over Magaluf, import prices are higher and issues are slower.
Blister plasters. Even flip-flops can be lethal.
Before a night out, make sure your PJs, make-up wipes and a bottle of water are all within easy reach - makes things so much easier on return (a friend of mine fell asleep in her suitcase while retrieving her pyjamas).
Pedalos are fun, and wet. Your stuff will get soaked, so bear this in mind when taking a bag.
If you're going as a group, stick like-with-like when allocating hotel rooms. Don't put OCD Monica with Little Miss Messy - even the best of friends clash over things like that.
Accept that boys will always outnumber girls in Magaluf. You can take advantage of better drinks deals that way, as most places are eager to even out the numbers.
Within reason, don't be afraid to kick a guy who won't take no for an answer - my friend didn't want to dance with you, OK?
Set some money aside for post-night-out munchies, and say goodbye to your diet, because Magaluf knows how to do chips.
Unless you're planning some serious travel days, leave the Spanish phrasebook at home.
Don't be afraid of the strip - it provides some of the best nights out ever.