Lol well we've never seen any mega yacht's in Greenwood yet, but other than that we've seen various sized boats. As far as launching fees you have to pay to get into the park itself but no there's no one at the landing.
ADMISSION $3 adults; $1.50 SC seniors; $1 children age 6-15; age 5 & younger free https://www.connectlakegreenwood.org/boat-safety-and-regulations/ Hope those help.
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