Possible Clues:

• You may play them where there are leis
• Lute descendants
• Guitars' little brothers, familiarly
• Small strummed instruments, for short
• Instruments of Hawaii
• Guitars' kin, for short
• Strings at luaus, for short
• 'Aloha Oe' instruments, briefly
• HI-strung instruments?
• Small guitars?