Check that. I made a mistake on my calculations! lol
Just saw this as well:
** 50% discount: Valid arrival dates for a 2 night/3 day stay include 10th - 12th, 18th, 19th & 25th February 2011. Valid arrival dates for a 3 night/4 day stay include 10th, 11th & 18th February 2011.
40% discount: Valid arrival dates for a 2 night/3 day stay include 9th, 13th - 17th, 23rd, 24th & 26th February ; 12th - 14th & 17th - 22nd March 2011. Valid arrival dates for a 3 night/4 day stay include 9th, 13th - 17th & 23rd - 24th February; 12th, 13th & 17th - 21st March 2011.