Fran: I love your enthusiasm!
If you would like suggestions regarding a fbwo I could suggest the circuit that I started doing this month. It's a little shorter than what I normally do but it is more challenging because there is no rest between the sets. If you have seen this before then I apologize. Here it goes:
20 minute cardio warm up. Treadmill is fine. I usually do HIIT on the treadmill or elliptical. Enough to get a decent sweat going,
10 reps of dumbell squats drop to the floor and then do,
10 reps of pushups, pick up another set of dumbells and do,
10 reps of stiff legged deadlifts,
10 reps of bent over dumbell rows
http://www.expertvillage.com/videos/...umbell-row.htm
10 reps of shoulder presses
When you finish that set take a minute break and then do it over again 3 more times with a small break between each set. The third set is the most difficult because you know you have to do it all over again one more time. By this point I am usually spewing sweat from my mouth as I am exhaling and counting out my reps. Not a pretty picture, but effective.
It's a different kind of workout than I've done previously but I think its good to mix this in every once in a while to keep myself from getting too bored. Without the breaks it really becomes a bit more of an endurance challenge for me. Feel free to tweak it with extra sets, reps or other compound exercises. If you like it and have tweaked it somehow, let me know. I'll try your changes too.
Good luck with the food plan. I would try to get in some protein with the snacks as well. Just don't fall into the peanut butter jar like I do in the late afternoon.
Do you like hardboiled eggs. I sometimes boil a dozen of them to have on hand and eat four of the eggs whites with some fruit for snack. I also rely heavily upon the cottage cheese mixed with lf yogurt and berries, or two lf mozz cheese sticks and an apple/orange can get me through the three to six o clock hours.
I also make turkey meatballs using the leanest ground turkey breast you can buy and keep them in the freezer. If I'm really hungry and dinner is a long way off I will eat three/four of these for snack too. If all else fails and I feel a binge coming on, before I reach for anything else I pour a 8 oz glass of milk and mix in the protein powder and then have another tumbler of ice water. This usually does the trick for me.
Enjoy your three weeks!
OK, so train me! more........
For protein, I almost always have hard boiled eggs around, and cottage cheese with some sort of fruit. Our strawberries are setting fruit, and I can't wait til they're ripe! 
Really though, it sounds like something I'd like - just need to work up to the number of times through, and adapt it since right now I can't do "real" squats (I do less deep ball squats on the wall).
