One day in Haikou, the living expenses of 30 yuan may be a little insufficient. Haikou, the capital of Hainan Province, is a modern city with relatively high prices. On average, the per capita consumption level of Haikou is slightly higher than that of other cities.

The specific living expenses will vary according to personal consumption habits and needs. If you only need basic living expenses, such as catering, transportation and some daily necessities, maybe 30 yuan a day can barely make ends meet. But if you still need to pay for accommodation, entertainment and other expenses, maybe 30 yuan a day is not enough.

In addition, special circumstances also need to be taken into account, such as traveling or staying for a long time, and the living expenses in 30 yuan for one day may not meet the demand. It is suggested to plan the living expenses reasonably according to the personal situation and budget to ensure the quality of life and experience.

In short, the living expenses of 30 yuan per day may be relatively small, and it is necessary to judge whether it is enough according to the specific situation.