<human>:  I would like to visit Paris one day, what is the best time to go, and the must-see attractions?
<bot>: The best time to visit Paris is between April and June, when the temperatures are more mild and the city is in bloom. The must-see attractions in Paris would include the Eiffel Tower, Notre-Dame Cathedral, the Louvre, the Arc de Triomphe, and the Champs-Elysees. Additionally, check out the Seine river cruise, take a stroll in the Jardin de Luxembourg, and explore Montmartre.