Hi Everyone

,
Hope you are all well. I am here to ask for your help and expertise with regards to travelling around Southeast Asia.
Basic Facts & Dates;
1. 4 travellers in total (3 males/1 female)
2. 25-28 years of age
3. 2 out of the 4 will arrive in Bangkok on the 19th of March at 4pm (local time).
4. The other 2 will arrive in Bangkok on the 25th of March at 4pm (local time).
5. We will all be departing from Bangkok on the 8th of April midday.
I am going to be a little awkward and start backwards.
As a group we have decided to meet in Bangkok on the 25th of March and stay here for 2 night (if you have any suggestion on hotels etc... please let me know). Below, i have given you an outline of our possible travel routes.
Sat 27-Mar-2010 Flight to Koh Samui at 7am (arrive 8.30am)
Sun 28-Mar-2010 Koh Samui
Mon 29-Mar-2010 Ferry to Koh Phangnan
Tue 30-Mar-2010 Koh Phangan (FULL MOON PARTY)
Wed 31-Mar-2010 Ferry to Koh Toa
Thurs 01-Apr-2010 Ferry to Koh Samui
Fri 02-Apr-2010 Phuket
Sat 03-Apr-2010 Phuket
Sun 04-Apr-2010 Coach or Train to Koh Phi Phi
Mon 05-Apr-2010 Koh Phi Phi
Tue 06-Apr-2010 Coach or Train to Phuket
Wed 07-Apr-2010 Flight to Bangkok at 15.15
Thurs 08-Apr-2010 Flight to London at midday
Is there any other logical way of working around the various island and seeing the best of the south within the 2 week period, or do you think we have got it covered?
For the 1st week, my friend and I are confused on where and what to go/do. As we are going as a group down south for the 2nd and 3rd week, we are more interested in travelling around the rest (north/east/west/centre) of Thailand or even (if you guys suggest it...) go to either Cambodia/Vietnam/Laos etc...
We want to get exposure to the Thai culture, but at the same time have fun with the possible activities/adventure/excursions/nightlife, that Thailand has to offer.
If anyone needs anymore information with regards to our plans/idea etc... please let me know.
Many thank and look forward to your great advice.
J