Keep all agreements in writing. The Kauai Board of Realtors sells rental agreements to the public. Talk to your prospective tenants and explain the importance of paying their rent on time and keeping the property in good shape. Follow the tenant landlord tenant code and remain cordial at all times. Yelling at people does not motivate them.
Late fees do.
If no pets are allowed make a substantial financial penalty if any pet is seen on the property at any time and have a per diem charge until the pet is gone. This one's optional. Have the rent include yard service. You will be guaranteed the yard will be kept up.