Your question is too simple to answer in order to prevent misleading!
However, I would like to give you a suggestion for reference. Hainan is a big place. It is better to provide more specific administrative divisions, such as cities and counties. Or other landmark buildings. You can also find friends, neighbors, colleagues and fellow villagers of the elderly before their death and ask for relevant information. You can also turn to the public security department of the old people&;s domicile to find some clues.
For reference only.