RedactedNarrative: Based on my investigation it appears that OPERATOR 1 may have been impaired due to alcohol consumption.  He decided to operate a PWC without proper navigation lights around 01:00 hours. The sky was clear that night but there was not much ambient light.  The only confirmed light was what was coming off the houseboat that he was staying at.  Witnesses reported that he had left on the PWC and that they could no longer see him one he got behind the houseboat.  After 5 to 10 minutes of hearing the PWC operate they heard a crash.  OPERATOR 1 had grounded.  Based from what they heard the witnesses stated the vessel was not idling nor wide open.  One of them believed it may have been going between 30 and 40 MPH.  I witnessed some cracks and scrapes to the jell coat of the PWC.  I did not notice any other damage at the time.  The vessel had a registration of NV6263LC and returned to a 2006 PWC registered to Skiwi Rentals LLC.