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> I've always wondered why we don't have any actual photos of them (or anything else) sitting on the moon.

We do.

http://www.nasa.gov/sites/default/files/images/584392main_M1...

That picture is from Lunar Reconnaissance Orbiter Camera (LROC); you can find pictures of all the Apollo landing sites on its webpage.[1]

[1] http://featured-sites.lroc.asu.edu/

Hubble does not have the angular resolution to resolve the objects left behind on the moon; you can do the calculations for yourself.[1]

[1] http://en.wikipedia.org/wiki/Hubble_Space_Telescope

The moon is effectively at infinity in terms of focus. The problem is not that it can't focus, but just that the stuff is too small. Hubble has taken pictures of the moon.

The problem isn't focus, it's tracking rate. Hubble can take pictures of the moon, but not long exposures; it can't spin fast enough to follow the moon through its field of view, so it has to point where the Moon is going to be, then take the picture at the moment it passes through. https://what-if.xkcd.com/32/