Nothing if you are walking the Riverwalk. For the boat ride it is $12 for an adult ticket.
The Riverwalk is free to walk around and see everything but is $12 per adult for the boat ride.
$12 per adult for Riverwalk boat tour
It is free, but it will cost if you want to go for a boat ride. Not sure how much it cost.
The river walk is free to the public, it is technically a Texas Park
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