T.M.
Hi,
Both of my boys were around 19 months/2 years old when they gave up naps. I think it is important for you to still try "quiet" time. It could be laying in their bed, playing quietly in their room etc. What we did though, was we put them to bed earlier at night. They would go to bed around 7:30. They get up at 6:00/6:30 in the morning but it has worked out nice. They are both 7 and 5 and still go to bed around 7/7:30 at night!