To clip in or not, that is the question.
Strickly a personal matter. If you're use to riding clipped in, go for it. If not, no reason to on a tour. Clipping in offers advantages to competitive cyclist, but probably not to the average tourer. Cleated shoes are not suitable for much off bike activity, necessitating a second pair for walking about. Good running shoes work well on and off the touring bike.
As for tires, as long as you're gonna be staying on hard surfaces, a kevlar lined 28 mm or bigger will work fine for a short tour. Longer tours with 40 pounds of gear, 32 mm and up. Schwable and Continental make reliable puncture resistent tires for touring. I'm rolling on Continental Touring Plus, 32 mm. 1500 flat free miles so far.