BWV is closest to MGM. It is about a 15 minute walk.
HTH
But if it the weather is hot and humid, it'll feel like an hour!
Another tip on hot & humid days is to walk through the BWV and exit at the stairwell on the far side of the quiet pool, near the tennis courts. That way, a good portion of your walk to MGM will be in air conditioned hallways!
Just wondering which one and way is faster?
It's a good 10 minute run either way when you reach MGM by boat and realize your young cousins forgot their park passes and you have to leave them with your wife and kids and run back and forth to get them for them ( so as not to drag everyone ) .... But maybe that won't be an issue for you