Have a healthy one! I've been making fruit and vegetable heads the past few years. This "still life for Rosh Hashannah" is as healthy and traditional as you can get.
I'm going to ditto, recommend Ya'aqov's Rosh Hashannah Challenge. It deals with human relations, bein adam v'chavero. I really don't think there's anything more important than this.
We must remember that all the teshuva, repentance we do to G-d is worthless if we don't repair our relations with other people. G-d can't fix it; only we can. A "thank you," a smile and a helping hand go a very long way. These are mitzvot, no less than eating the most mehadrin foods. It's a tough one for us all, so let's all try.