I agree with mixing it up and not trying to train too much, too quickly - let the body adapt. We have been "training" for the last couple of years - training in quotes because most of it was just normal fitness, but every step we took was "for the Camino" once we decided that we were going
Our focused Camino training started in January - we are going in June, so just 2 months away. I feel like we could leave today and be great, but we have 2 months to go, so we will keep training. We don't have the time to devote to walking 20km on a regular basis, so we do what we can. Each month we do the following:
* A hiking weekend, which means hiking both Saturday and Sunday, something reasonably long both days, with packs and the boots we are going to take. Last month we did a 20km hike, which was moderate-to-strenuous. Then we did about a 10 km hike the next day, very moderate. This coming weekend we will do 2 hikes of similar distance, a little more strenuous.
* 4 long walks - road walks, no packs, go for both speed - these walks are 9-14 km, depending on how much time we have. We stop in the middle for coffee and a snack (you know, for realism in our training). So basically 1 long walk each weekend with an extra one stuck in where we can - the days are getting longer, which makes it easier, but my work travel schedule is also ramping up, which makes it hard.
* Cardio, yoga, and strength training through out the week - generally about 3 hours each week.
I've lost body mass during this training - I know because all of my clothes are getting roomy - but my weight has stayed exactly the same. I am definitely burning fat and building muscle.