UGH!!!

you could always see how it goes, do the 1/2 and see how you feel.  Its going to hurt and may need MORE than a 2 week recovery.  How important to you is it to be "fast"?  How important is the medal?  Will it be meaningless if you are not  "fast"? Fast is relatvie which is why I put it in ""   Keep training next week and enjoy your vacation

were there is a will there is a way   train on the cruise.  You could always do laps around the ship. When on vacation I tend to run more. It makes me feel better about all the extra food I eat.

You should at lest try. Better to have tried then never had started

The other posters have some good points. Would it be satisfying to walk/run the races? You probably know this, but there's a lot of fun on the course. You could take it easy, take pictures with the characters... If there is a race out there to relax and have fun, Disney is it. The 20th Anniversary Mickey medal looks pretty neat. 

Have fun on your cruise. I took a cruise on the Oasis of the Seas over the summer. It has a really nice track  

Take todays weather into account for your UGH and slog fest.  It was a lot warmer today than it has been in the past week or more.  Makes a hard adaptation to go from 40 degrees to t5+ in one week.  

Goofy challenge is hard, if you really want to do it, it will take a lot of concerted effort even while on the cruise.  However, they run that challenge every year.  It will be there another year.

Marathon recovery normally takes more than 2 weeks.  So I guess it's OK.

Seriously (not that I wan't being serious already), 2 months is enough time to get there, if you train during the cruise.

THIS.  We still have 2 months...so it can get better.  Then, just think about these things listed above.  Is just finishing good enough for you? Can you do it without causing significant injury?  I did Goofy 3 years ago with what I thought was a stress fracture (with my doc's permission because I stayed in a boot after the races for 8 weeks...and I think it was prob more metatarsalgia anyway)....ran/walked it all with a 3 min run/2 min walk and got through it.  I hurt like a mofo from soreness, but did no long-term damage.   I wanted that medal.

(last year, on the other hand, I was really injured to where my gait was all messed up and had to dnf at mile 8 of the marathon...that sort of sucked. But I'm coming back this year!  Come on!! )

Editing to add that you can run on a cruise ship...it's just lots of laps. I've done 8 miles on one once.  And there should be treadmills and spin bikes.

HTFU....someone had to say it.

On the cruise, run laps of the ship's deck (they will also have a gym/treadmills).  On the island stopovers, see the sights on a 5-10 run.  Marathon training takes less than 90min/day.

How bad do you want the medal?

I ran on the boat.  Up to 7 miles.  2.5 laps / mile.

Ran on island 5k.  I am NOT suited for heat!

I have 3 twelve mile runs under my belt.  Running 30 miles / week.  I am used to running 30 miles in two days in prep for a marathon.  This weekend I will do a 16.

I will probably walk at least 6 miles of the marathon and 6 miles of the half (with my wife & two daughters).

None of this matters after I saw this video.

http://www.youtube.com/watch?v=8I6Sr4TPoKo

Yes, I am THAT shallow!

Mike, we'll all be pulling for you, if that helps!

BTW - Kudos for running while on a cruise, I never managed to do it even though I took my running gear.