What's the best "detox diet" to try?

I don’t want to fast, I don’t want to lose weight, I’d just like to eat healthier. I do a lot of exercise but I get sick often and am susceptible to skin problems and the like. I’d like to get rid of all the nasties in my body and strengthen my immune system.

Thing is, I’m not very good at sticking to things like this unless it’s laid out in front of me, so I can’t just go “I’m going to eat healthier” and do it. I’m probably going to need a specific diet I can follow, or even just a list and some recipes I could try.

Have any of you tried a detox diet? Can anyone help me?