Sounds like good advice given all around.

Your horse may be bored and feeling pretty fresh.
I know my horses can be fresh in the spring when they have had a few months off.
I work on ground work with them.
Lungeing is a great way to evaluate your horses' mood.
Do you know anyone locally that can help you with learning how to lunge your horse?

Parelli's 7 games are fun and Clinton Anderson has great tapes called "Lungeing For Respect". Very easy to follow.