M.K.
Much to my dismay, my 3yr old seems to have abandoned her naps too. I still require her to have quiet time every single day (while her brother naps), but she only sleeps at nap time about once a week. Her bedtime routine starts at 7:30pm (down by 8pm...but usually not asleep until 8:30pm) and she wakes up at 7am.
I think a couple other posters gave some great advice -- try moving bedtime earlier. Start bedtime routine early enough that you leave his room at 7:30 (or maybe even 7:15). Even if he won't nap, at least you'll be adding more sleep at bedtime. I know it sounds counter intuitive, but it won't make his wake time earlier.