help! I'm leaving in 3 weeks and still don't know where to start!

I'm hiking the camino del Norte, because of my schedule, i have 5 days that i need to hike before starting in irun where I'm meeting family. I thought i could hike from sjpdp to irun, but i don't see a trail. Then i was planning to walk from jaca to somport and take a bus to irun, but I'll be walking backwards. I really want to hike in the pyrenees, but i dont see any parts of caminos that would take me through the pyrenees to irun. I'm flying into barcelona and am on a really tight budget. I need some suggestions, I'll be walking alone during this time...

Thanks so much, that really helps! I will probably go with the southern foothill route from Roncevilles to Irun. I'll let you know how it goes. Thanks again.