we are a group of 6 (4 adults & 2 children), arriving at suvarnabhumi airport at 6 am. after immigration and luggage collection we should be out by 7 am. since we are staying at somerset lakeside should we take the public transport(train) or should we opt for a minivan. main concern is with regards to bangkok traffic at that hour. If we do opt for a minivan, then do we need to reserve it before hand, or can we book one after we land? also what is the cost?