So the activity I wanted to share is one that Mr. Maverick came up with himself: Box Floor. He emptied out all the bins and started playing with them. It immediately reminded me of Lava Floor (which I loved as a kid), but the whole point is to get around while manuovering in and out of boxes. It is so good for balance and practicing lifting legs higher than regular walking; it also helped him learn how to move without tipping the bin over (since he would hold the bins for balance). The picture shows Mr. M at 21 months, but he started doing this since he got them; I just had to help out a little since he had only just started walking without holding anything.
If you don't have bins like these, I recommend shoe boxes, plastic ice cream tubs, diaper boxes, etc. Anything that comes up to your child's knee should work. Mr. M liked to sit down in them as well, so be warned: it might get squished if it can't take you child's weight (we have some plastic baskets he can't sit in, because they bend/crack).