I agree with everyone who said, water, water, and more water. No soda, not pop, not juice. Water. And, that said? The last few months I've fallen down on the water thing, and, yes, my skin shows it.
As others have mentioned, mangoes can really be a bear; some people are highly allergic, which, trust me, will not help your complexion.
Avocadoes? Any sandwich or salad can be improved with a sliced avocado. But my all time favorite is to simply to wash, halve, scoop out the pit, then fill the cavity with anything you like. I caught my husband (haha) filling it with steamed, seasoned, cold shrimp as a first course. But a dab of any mayo based salad (chicken salad, egg salad, ham ... you get it) works well as a filling lunch or light supper. If you like curry, add your favorite curry powder to the salad. Make sure to serve it with a spoon as well as a fork, so you can scrape the last delicious bit from the shell.
My husband only likes green mango. So, when I can get them, I put them on my mandoline and julienne. So much easier than other methods. I just peel with a regular potato peeler, ascertain where the pit is, then go to work. Then I use a white (something like red wine or balsamic discolor it and make it unattractive), mild/sweet vinegar (rice is one, malt another, but even cider), a pinch of sugar, and a pinch of hot pepper flakes.
Both of these are good, everyday things, but also can be elegant presentations.