I have been using Neutrogena sunblock for some years now. Try to put it on every time I get out to jog in the sun.
The two I like are "Neutrogena Sensitive Skin Sunblock Lotion, SPF 30", and "Neutrogena - Age Shield Face Sunblock Lotion SPF 70". The main reason for liking both of those is that I can put it on my face, and I have never experienced the burning eye problem if a trace gets into my eyes.
Some other sunblocks, including Neutrogena lotions, will sting the eyes like crazy!
Of the two I named above, the first one has lots of white titanium dioxide, and tends to make ones face look a little ghost-like. But it really works.
I recently discovered the second "Age Shield Face", and tried it because of the "Face" in the name. I figured it wouldn't hurt my eyes much. And I have used the whole container, with great results. Feels great after applying -- no greasy feel.
Regarding the number of applications: I find that a single application in the morning will prevent any burning even when I ski all day. On extra bright days, I might add a second application at lunch time.
