This is what we do on Friday in our classroom:

Math & Reading. That simple. Friday is our Homeschool Park Day, so we don't attempt much. However, I have found that the hours before we leave at 10 have to be filled somehow with productive activity, so I pull out some handy math worksheets, and we get after it. Plus my planning book looks better with those check marks!

On days when we've had a morning field trip, and I know I cannot expect a lot of productivity out of them, I've also done this: I will put the names of 2 core subjects and then maybe 3 supplementary activities, and a couple of fun ideas (read a book with Mom, etc.) on paper, put it in a hat, and they each have to draw 2 pieces out. If they draw their two core subjects, then guess what. We do those. If they draw 30 minutes of reading & coloring with Mom, then they get to do that. Oh, they get to have one opportunity for a re-draw.

The times we've done this, it's been neat. Because then it's their drawing & not my insistance that they do a subject. I am blessed with children who love to learn, so this is one way I lighten the load a bit.

Just another idea I'm passing along!