Chefisaac, it has happened to all of us.

I was so arrogant one year that I went on a supported tour without hardly any training, my legs suffered terribly on that ride.

Now I have always try to be prepared with plenty of riding in the spring. I also ride more training rides with a loaded bike. When its too cold in the winter I ride a trainer. I don't belong to a gym anymore but when I did I would go to spin classes because having someone yell at me pushed me harder.

You will know that you need work harder preparing your fitness to have an enjoyable tour.

I just finished my supported tour last week and I prepped well enough that I didn't suffer during the rides.

Good luck on your 4 day tour. Certainly re-evaluate your packing list for this short tour. Half of the items that I brought along on my tour I never used.

The items that I brought along that I didn't use were
Tight
pants
too many sock
too many riding clothes
jacket
windbreaker
too much food

I just used my rain jacket for the cooler mornings and washed my clothes every day after the ride. all of my clothing is synthetic and dries quickly except the shoes and gloves.

I'm not familiar with your gearing but after my trip in 2010 (there are a lot of hills in south eastern Ohio), I changed the granny chainring on my crank and changed the rear cassette from an 11-27 to an 11-32.

This year's tour I rode my Waterford but never used my 53 tooth chainring on my crank.
I may look at changing to a mountain crankset for the steeper hills, since I don't use the big gears any more.