My offers:
1) "Stay twice and get a free night or 25,000 points or 10,000 miles (1,250 AIR MILES or 160 Airpoints). Must book direct. "
2) "Stay twice again and get a 2nd free night or 25000 bonus points or 10,000 miles. Must book direct. "
What qualifies as a "stay"? Would group/conference rates qualify for this?