Guanabara Bay Cruise with Optional Seafood Lunch. Sail on Guanabara Bay for a half day, viewing the Rio's picturesque city skyline and Sugar Loaf mountain from the water. On this 4-hour cruise from Rio, glide through the bay's tranquil waters, passing islands and historic forts. Upgrade your experience to enjoy a local seafood lunch at a restaurant on shore. Round-trip transportation from most Rio hotels is included. Book and Save 10%! Guanabara Bay Cruise with Optional Seafood Lunch.