My boys are now 5 and 3 (where has the time gone?!) and we have been in this sort of transitional stage for a bit. Brayden, my oldest, hasn't been a fan of nap taking in general for about the last year and a half, while Brody was still taking one a day for about and hour and a half.
Now, neither boy naps unless there are extenuating circumstances (they've just been at my parents house, we've been on vacation, they're sick, etc).
Some of my twitter friends with older kids have said that they still let their kids play quietly in their rooms in lieu of naps, while others have said that once they stop napping, they don't go to their rooms at all during the day.
In our house, we have a playroom downstairs and their bedrooms are upstairs. I've been having them go into their rooms but they can play quietly or watch a show. About every other day I let them go into Brody's room together (where they are supposed to play quietly but that really doesn't happen).
For those of you with kids that are past napping age, what do you do? How did you transition them from nap time to play time? Do they still have a quiet time in their rooms each day?