"My last query to those who have been to AC before: If you had seven days/nights, what would you consider a must do? "
nothing. dont stress yourself planning stuff to do. AC is such a great place to just kick back, wonder from bar to bar, meet people and drink beer.
my advice would be to not plan or book anything. wait til you get here. if you wake up one day and feel like going on an adventure theres always someone willing and able to take you where you want to go.