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The more I look at the amphitheatre, the more I start to think it doesn't look as good as it should. So, in other words, this isn't the final version of it. I definitely will be changing it around. Any particular ideas?
^ Well... an amphitheatre in general does have seating-rows slowing up from bottom to higher (like a stadium has), so may be you could create something like that around it. At least in a half circle I would say, while "classical/historical" amphitheatres nearly always have a full-circle form: upgoing seatings all around, and the place of stage in the middle. (more modern variations do use the half-circle, but still need the upgoing seatings).
For Trees: I don't know a trainer that will let you place trees in big amounts in one go.
Any park however will benefit from trees and bushes that are placed with attention (= more work and thought), and a trainer will give you the possibility to place trees where you want them (in cases where the game refuses to do so) or to place bushes/flowers around a full-time tree (you can do this by using 8cars "zero clearance relative").
keep building and have fun!
Emergo