I would say it might be a good idea if you made them. If you were only 2, then I could see trying wing it, but 5 is still a pretty good number.
January is kind of a funny time to visit. Between the waning New Years crowds, the marathon, MLK weekend and (rumored) a cheer compeition, it might be a little busier than you think. If you know for sure that there are places you'd hate to miss, then make the PS.
Solotraveler