I did the same; put a bunch of decorations on the floating islands.  Love the Eiffel Tower at the very top  lol.   PLUS, this is the only other farm you can put a second Aussie Winery on.  

My big question is ... Now that I've completed Hanging Gardens, and I keep getting Golden Trowels from harvesting crops on other farms, What can I buy (or do with) all the extra Trowels.

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