I'd find something for him to do that *doesn't* come easily -- it would probably have to be something outside the academic realm, maybe a sport or martial art.
Why? Because eventually, he's going to outgrow his genius and reach a point where he needs to study and work hard in order to succeed. That seems to be the point where most child prodigies burn out. Their whole ego/self worth gets tied up with being "smart" and succeeding effortlessly -- when they fail, it can be devastating, and they may decide that they're not so smart after all and give up.
If he experiences some failures early on, he can develop the resilience to keep working when things get tough. There's a lot of evidence that, in the long run, success has a lot more to do with effort and focused practice than innate talent.