LiLo appeared to be in good spirits as she drove the boat in a colorful striped one-piece.
In another shot, Lohan smoked a cigarette while casting her reel off the boat -- engagement ring in full view.
The Mean Girls star appeared to be enjoying the company of close friend Golan, who spoke to ET about Lohan just the day before.
"She's not been speaking to anyone, including her family. She's been on a total timeout," Golan told ET's Jennifer Peros in a phone interview. "Any interviews given about her are completely not true."
"Lindsay hasn't even had her phone with her, except for taking some private photos," she added. "She's enjoying a lovely holiday and some downtime now in Europe with her girlfriends. She's working her matter out privately, as she's stated. Sometimes the best therapy is a pause."
Of course, Golan was referring to recent drama between the former child star and her fiancé, 23-year-old Egor Tarabasov. On Saturday, Lohan posted a series photos to Instagram with captions accusing the Russian business heir of "not coming home," and of cheating on her.
Days later, Lohan apologized on Instagram for publicly airing out her relationship drama, and asked for privacy. She reportedly changed the locks on her London home and hired security to prevent Tarabasov from entering the premises on Monday.
See more of what Golan had to say in the video below.