Week One of Training for Disney

so, it is twelve weeks until my Disney Marathon. I began my training this week...Schedule says:
Monday - Rest
Tuesday - 4 miles
Wednesday - Rest
Thursday - 5 miles
Friday - Rest
Saturday - 4 miles
Sunday - 10 miles

Here is what I've done:
Monday - 3 miles
Tuesday - Rest
Wednesday - 4 miles
Thursday - 5 miles

Plan for the weekend:
Friday - 3 miles
Saturday - 4 miles
Sunday 10 miles

My Achilles tendon is very tender. I am not sure what to do...I 'should' probably rest it...but mentally I 'need' to run!