Good point - there are four of us traveling together & we will all have backpacks, so luggage isn't really an issue & as far as stairs go, we're in our mid-20's, so stairs wouldn't be an issue. I don't recall it being only 300-400 baht out of the airport, last time I went there, I was in a taxi by myself & I think it was more than that (counting express way fee & airport fee).