If you're in Boulevard Rainier III and interested in museums, I recommend visiting the Oceanographic Museum of Monaco. It's located nearby and is one of the most popular attractions in Monaco. Alternatively, you may also want to visit the Prince's Palace of Monaco, which has a museum showcasing the history of the Principality of Monaco.
As Boulevard Rainier III is a relatively small street without many food establishments, I'll suggest some popular and typical dishes from Monaco that you can try while exploring the city:
1. Barbagiuan: a savory pastry filled with Swiss chard, ricotta cheese, onions, and Parmesan cheese.
2. Socca: a thin, crispy pancake made with chickpea flour, olive oil, and salt.
3. Fougasse: a type of bread similar to focaccia, often stuffed with olives or bacon.
4. Stocafi: a dish made with dried cod, cooked in tomato sauce with garlic, onion, and herbs.
5. Pissaladière: a type of pizza with caramelized onions, anchovies, and black olives.
These dishes are commonly found in traditional restaurants and markets throughout Monaco, so you shouldn't have trouble finding them.
Some fun activities that locals enjoy in Boulevard Rainier III and Monaco include:
1. Visiting the Monte-Carlo Casino and trying your luck at the slot machines or table games.
2. Exploring the Jardin Exotique de Monaco, which has a wide variety of exotic plants and stunning views of the city.
3. Taking a stroll along the Port Hercules and admiring the luxurious yachts docked there.
4. Going to the Larvotto Beach to sunbathe, swim, or participate in water sports.
5. Attending one of the many cultural events that take place in Monaco throughout the year, such as the Monaco Grand Prix or the Monte Carlo Jazz Festival.