My current favourite facial sunscreen is SkinCeuticals:
http://www.skinceuticals.com/_.....spf-50.htm
It's slightly tinted (not a lot) and could be worn alone, or with foundation on top. It works well with foundation in that it doesn't ruin makeup. The Skinceuticals Physical Fusion sunscreen is my all-time favourite facial sunscreen ever. It has a really pretty effect on the face, so pretty that you might find yourself skipping the actual makeup! Note: apply - and it seems almost greasy/oily. Let it sit and dry a bit (maybe five minutes tops) before applying makeup. It dries to a non-greasy finish.
Meanwhile - in past years, I've really liked Neutrogena Ultra Sheer Liquid Daily Sunscreen:
http://www.neutrogena.com/prod......do?sortby
This particular version is mattifying - very helpful in humid, hot situations. Makeup actually stays on longer and better than without it. I've tried many other variations of Neutrogena sunscreen, and this one is the best of them, in terms of working well with makeup in hot summer situations.
In terms of re-applying actual sunscreen - I don't normally do this. But, when I do want a bit of a touch-up, I usually apply Jane Iredale pure pressed mineral makeup, which has sunscreen in it. It's in a pretty compact that I can carry in my purse for touch-ups if/when needed. It's a pressed powder though, so you might not like it after all. Just sharing that this is one of the ways my sunscreen gets "re-applied"...face gets a bit oily, makeup needs a touch-up, and out comes the JI pure pressed compact.
http://shop.nordstrom.com/s/ja...../3053523?c
I tend to agree that physical sunscreens are better than the chemical ones, and the SkinCeuticals I mentioned above doesn't have the usual 'white cast' that you can sometimes get with physical sunblocks.
Also agree on hats, spraying a spray sunscreen on the top of your head before you head out, remembering your feet and hands etc.