No you dont I agree take the boat tour it's cheap and is well worth it. Have a great time.
Access to the River Walk is free -- to walk and explore. Suggest taking a boat first to get your bearing first to get an idea of where you will want to walk to first.
No, riverwalk ride in the boat is $12 per person. They have electric scooters everywhere to rent and parking is reasonable if there all day but they have $1.80/hour parking by the mall.
No its open and there are boat tours that leave about every 10-15 minutes or so from several different locations...the boat tours are great!
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