From the Carnival Cruise Pier #4 in Old San Juan, is it okay to walk to the CVS on Paseo Gilberto Concepcion de Garcia? Is it okay to walk from the pier to the Latin Roots restaurant on Recinto Sur Comercio Street? (I hope I've gotten those street names correct!) What I mean by "okay" is...is it fairly simple? Or would taking a cab or the free trolley be better? If it is possible to walk, about how long would you say it would take to walk to both?