We've never tried the employee parking lot path -- I didn't know it existed until it was mentioned here! I think the Woodstock Lawn sounds like the best option: from the satellite map (Googled and pasted below - appears to show the employee lot path in green, the route from Woodstock lawn in orange-yellow, and the path through the pool area in yellow), it looks like the walk from there isn't significantly longer than going through the employee parking lot, and as you mentioned, by going that way we can see if there's a boat available.
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Image credit: OrlandoInformer