Even better. That gives you a year to do a bit of research on lodging, watch for sales, and possibly find something interesting to see/do in the port where your cruise starts.

I always try to arrive a day or two ahead of time. Not only do I like having the cushion just in case something goes wrong with my flights, if I am ever unfortunate enough to have my bag not arrive, I'll want the extra cushion - either so my bag does turn up or so that I have a bit of time to shop for new gear for my holiday.