It's a third of a mile (400m) to the JW Marriott, and another third of a mile to the Ritz Carlton. The amenities at JW Marriott and Ritz Carlton can be used while staying at Lakeshore Reserve. You can charge things back to the Lakeshore Reserve room at JW Marriott, but need to pay for activites/food/etc at the Ritz Carlton directly.
About 1/3 of a mile (along the walk path around the lake) and yes, Lakeshore Reserve guests are able to use the Ritz amenities.
They basically share the same property
You can take a short (1/3 mile) walk or take a golf cart shuttle (it is free, but nice to tip them).
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