TIMP, thanks for your prompt feedback. It really helps a lot for my planning. I knew in my plan above, Day 3 looks crazy. I planned it that way mostly because the following tour itinerary I read:
http://www.goway.com/adventure/trip-...hp?trip_id=584

Looks like I will need to skip some stops. Here are some more questions:

1. You said Day 1 is ok. Does it include Freycinet National Park?

2. Day 2 - from what I read, I think I can skip Port Arthur. What's your suggestion for the day from Bicheno to Hobart? How much time can I have in Hobart?

3. Day 3-5, I think I will take your advice, and skip Stanley, etc. I haven't read much into Strahan tours. What tour would you recommend?

4. I'll be there Dec 3 - 9. How is the weather over there in early Dec?

5. For National Parks, can I buy a pass for 2-3 weeks of time for all parks I'm going while in Australia? or pass for Tasmania is just for the parks in the state? I searched online but kind of got confused.

Thanks!