Harrison's, cover to cover, in one sitting, that'll make a man out of ya boy!
Seriously I'm just reading for fun (ie non medical stuff). After finding myself unable to take my elders advise on things like 'how long to study for step 1' and 'how many interviews to schedule' and finding them to be totally right, I'm going to step into the abyss and take their 'slack off during 4th year' advise to heart. I did 3 hard months at the beginning of the year and now have basically nothing rigorous planned for the rest of the year (minus maybe a ID consult month right at the end to wake my brain up before intern year).
As far as preparatory stuff goes, I'm reminded of some advise I got on my sub-I by a fellow, "Sub-I's are good, but using a sub-I to prepare for intern year is like preparing for a car crash by banging your head against a wall."