Well i must say all these guys nailed it. Just do a routine check throughout the whole bottom of the boat. Make sure you dont have any blistering of the bottom. If you do you want to take care of that because matured blisters can cause major issues, for one water intrusion and fiberglass head achs. Next check all your running gear, be sure there is no pitting in the metals. Next clear out all your thruhull fittings, sometimes inside the strainer you'll find marine growth that hinders motor and hull performance. any build up of paint should be removed, keep your paint at a minimal thickness, reduces drag and improves speed and fuel efficiency. Reconditioning the props also is a great idea. then again this is all dependent on how long you intend on being on the hard.... oh dont forget those zincs.

Good luck