In Hawaii, frangipani flowers are joined together to make a loop which is worn like a large necklace. They are called leis. Other flowers can be used to make leis however the frangipani lei is arguably the most common.
Hosts often greet and put a lei around the neck of visitors which is a symbol of the host’s appreciation of their guests visit and their enthusiasm to host their guests.
As with any other gift between host and visitor, you should remember display or wear it for as long as possible.