Where to take a toddler?

I'm bringing my 4 year old this weekend and am wondering what the best area of the mountain to work with him is? We've been out a few days this year and once last year so it's not his first time on the snow, but he has not progressed beyond going straight super fast with me controlling him on a leash. Hoping to move onto some more personal control this weekend. He adamantly does not want to do the magic carpet anymore and can load and unload from a lift however. The longest run he has done so far is the beginner lift at sierra, so not super long, but would also like to give him an opportunity for something a little longer too if he is up to it. Would love suggestions, thanks.