Nope, no other tricks... im gonna assume that you know about cleansing, toning, moisturising, exfoliating and removing your makeup before you go to bed.
If you dont find yourself naturally wanting water then your just gonna have to force it, make it a routine. If i were you i would get a 1.25 litre bottle to start off with, drink half of it in the morning, have a glass of water at lunch time and drink the other half at night time. If you just try and make yourself drink more glasses of water a day you'll find yourself running to the bathroom constantly and it can be discouraging. Keep in mind, drinking lots of water means your body doesnt need to retain as much, so you'll be thinner. Drinking water also keeps the rest of your body healthy and working, which of course includes your metabolism.
I love love LOVE my diet caffeinated drinks as well, but when i found out what i mentioned above i cut back a fair bit, now i try and match any soft drinks with water like the person mentioned above. I am currently in the process of losing weight and ive noticed that if i go through a few days where i do not drink water, even if i am eating reduced amounts and exercising a lot, i do not lose weight. As soon as i start drinking lots of water, i lose it quite quickly.
Hehe i know you were looking for tips for your skin, but i thought i would mention the above as nobody has yet
Good luck!