The following are the best tourist areas in my mind:

1. Japan: May is the end of the cherry blossom season in Japan, and the climate is pleasant. You can visit Mount Fuji and other beautiful scenic spots.

2. France: May is the best time to travel in France. The temperature is suitable, markets and restaurants are open, and various activities are becoming lively.

3. Italy: May is the golden season in Italy, the temperature is suitable, and there are not many tourists in tourist attractions, so you can enjoy and appreciate Italian culture and food.

4. Canada: May is the cherry blossom season in Canada. You can enjoy all kinds of brightly colored flowers, and the climate is mild. The world's largest imported flower festival is also held this month.

5. Greece: May is one of the best tourist seasons in Greece. The temperature is suitable, avoiding the peak of summer tourism, and you can visit the blue Aegean Sea and historical and cultural sites.

These are the best destinations to travel in May, but in fact, the specific choice should be considered according to your hobbies and travel budget.