Add extra chafe protection to the lines. Set extra fenders to protect the boat. Also, remove all canvas, sails and the like to reduce wind resistance. Also, make sure the batteries that run the bilge pumps are in top shape. The heavy rains will put them to the test.
Many boats sink at the dock due to bilge pumps that failed sometime during the storm.
Remember that a hurricane can drop several inches or more of rain in a short period of time. It is a known fact that a boat on land stands a far better chance of surviving a hurricane than one in the water. If your boat is to be stored on jackstands, and is less than 30 feet in length, four jackstands on each side is recommended. Use five or six per side for larger boats. Experience has also shown that boats kept in the high-rise, storage rack buildings that some marinas use are very vulnerable to hurricane force winds.