K.P.
I would try pushing the nap later by an hour or two. My son is 4 and has stopped napping during the week for one simple reason... he's not tired at 1:30. On the weekends we all lay down for quiet time at 3:00 and he sleeps 70% of the time because that's when he's tired!
You could also try increasing his physical activity and see if that helps. For what it's worth, MANY children give up their naps around age 2. For most, it's closer to 3, but 2 is not unusual! Try quiet time and see what happens!