General, "old sage" wisdom would say there is really very little you're going to be able to do, on six acres of land that would significantly impact the gathering of nectar by the honeybees. However, that's not to say you can't try! It's just that unless every square inch of the whole six acres were covered by some high yielding nectar plant (like arrowhead clover, or some such), you're really planting for yourself more so than for the good of the honeybees. In other words, their forging area is so large that a few plants of this kind or a few plants of that kind isn't really going to influence the bees very much.

Now with that said, it's still a nice consideration and certainly you'll be able to see field bees working up close. Not to mention attracting butterflies too (since a lot of blooming flowers are commonly attractive to both insects).

If it was me, I'd want at least 4 peach trees that run from early to late season, as well as several other fruit trees with the same long season run. txbeeguy I think is right, 6a is not that much, but, I like the fruit too and the bees will be good pollinators.
clover is good, and can cover a lot of ground. It blooms for a pretty long time, and if you cut it you can get more than one bloom.

This is what I will be planting for my bees.

Here is a link that might be useful: Pollinator Mix