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Thankfully, today Google released a new Maps feature that lets you keep on searching, all the while saving your directions. It's pretty inconspicuous and easy to miss, but the new feature will make it easy for you to get the directions you need and find the businesses and points of interest you want along your route.
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The continuous search feature works like it sounds. All you need to do is search for directions as you normally would. Then search for anything you want to find along the way, and rinse and repeat. Once you complete the second search, you'll notice that in the bottom left hand corner of the sidebar there's a new blue box. You can click to expand to get a color-coded key for each search included in your Google Map.