My boat has weathered two class 3 hurricanes, (knock on wood), so far with only minor damage.
1. If marina is protected, and allows you to weather storm there, go ahead, but if not find a well protected area to tie up.
2. Double all docklines, use serious docklines 7/8's or better. two on every cleat.
3. Insure enough slack for each point of projected storm surge, but not enough for boat to hit things. (I ended up with a "spider web" of lines so during midpoint some lines were too loose, but others were tight, then during peak surge the loose ones were tight, and the tight ones were looser..)
4. Remove everything from boat, not nailed down, including all canvas
. (during Ike the screens on openable windows were peeled off). Boats that had furled sails
, or tied down biminis were shredded.
5. Fully charged batteries, and working bilge
6. A little luck, if you see neighbors boats not well secured, lend them some of your extra lines, and help them tie up, if not you will be picking their boat out of the side of yours. (most boats sunk during Ike were from impact from another boat...the rest ended up on the freeway miles away).
And remember it may seem like a hurricane hits every week, but an actual landfall at a particular point is more like 5-10 years apart.
And most of them are minor storms, no worse than what you would get in a bad thundershower that often get 60 mph winds.