We do Core Knowledge at my school and LOVE it! When you say the lesson plans are boring, I assume you're talking about the Pearson readers??? They can be a little dry, but be as creative as possible! You definitely need to go to the Core Knowledge website (
http://coreknowledge.org/CK/resrcs/lessons/2.htm) and take a good look at the lesson plans on there. Have fun with it! My kids learned about a couple of gods/goddesses each day and thought it was hilarious that the gods had so much drama going on! We also had a fun Olympics we did at the end of our unit.
Explore that website for some great ideas! Oh, I almost forgot...Colorado has a great website for Core Knowledge websites too. Try it at:
http://www.ckcolorado.org/lessons/2ndgrade.asp. Good luck!