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I've just been through the Parkour, there are 2 things I'd like to say about it:
I agree with Trenly on the head Parkour part, they do seem very random, maybe change them to jumping on seaweed or coral (just something more that shows off the map even better)
The iron bar Parkour part is very random too. It just seems like you've ran out of ideas at the end, maybe having vine parkour or something near the end? Could show seaweed. Or, even better, water parkour would make more sense as the whole point of the Map is to be under the sea.
Hope you like my comments and suggestions.
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