You can pay for parking at 3 CC. It costs 2.50 chf per hour or 12 chf per day. The bus garage side has a free parking space for small public transport. The area is close to the beach, with showers and public restrooms available. There are also many dining options nearby. You can visit Ile Saint Pierre by bike or on foot, and there's a restaurant there as well. Don't forget to take a nice walk in the city, passing by the castle.
There is a conveniently located parking lot, especially on weekends and holidays. Instead of paying for 3 parking spots and squeezing with others, you can park all 6 cars together for only 12 francs. Additionally, there is a great restaurant nearby where you can have a meal for just 10 francs.
The cost for a short stay may be somewhat high.