Water taxi is $20 round trip or $12 one way. Scenic, if you have the time and weather willing ...
There is a water taxi, but I'm not sure of the price.
Uber would be the best way, maybe $15-20 each way. You could use a cab but that would be a lot more expensive. If you don't mind walking a little bit each way, you could also metro, but that's not as convenient as the other options.
Take an Uber
There's no cost, I mean exactly what are you asking? You mean by Metro?
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