The Green Your Seasons campaign at Recyclebank claims to offer 90 points, but I got at least 150 by clicking on the links (Yes, that's really all you have to do, except for a few where you have to take a one-question quiz. You get the points whether you get the answer right or not.). Go to the top, use the white arrows on the screen to go to the first page and just move forward from there.
This site is one of the most disorganized, although that gives it a bit of a "treasure hunt" mentality while looking for points opportunities. I'll try to provide links to the big ones.
The rewards on the site go in and out, but I currently have a couple in mind: for 50 points, I can get a $5 discount at my local supermarket (on a purchase of $50, not exactly a difficult feat with two kids) and for 750 points, 250 My Coke Rewards points (which is now equivalent to six, not eight free sodas, but still gets me a 12-pack).