If you're seeking areas with a similar feel to Fontvieille, the best neighbourhoods to consider are Larvotto and Monaco-Ville.
Larvotto is known for its beautiful beaches and a more relaxed, resort-like atmosphere. It stretches along the coastline, offering direct access to the Mediterranean Sea and its public beaches. The area is home to several high-end hotels and restaurants, many with sea views. It's also where you'll find the Grimaldi Forum, a prominent convention and cultural centre.
Couples often find Larvotto particularly appealing for a romantic getaway. The proximity to the beach allows for leisurely strolls along the promenade, and many establishments offer stunning views of the Riviera, superb for a relaxed evening.
Monaco-Ville, often referred to as "the Rock," is the historic heart of Monaco. It's perched on a prominent rocky outcrop overlooking the sea and is home to the Prince's Palace, the Monaco Cathedral, and the Oceanographic Museum. Its narrow, winding streets are pedestrian-friendly and offer a glimpse into Monaco's past, with many traditional shops and eateries.
For those interested in history and tradition, Monaco-Ville offers a distinct experience.