From Points North:
Take 95 South to the Atwells Ave exit #21.  Go straight through 4 traffic lights and turn left at the 5^th traffic light onto Broad Street which becomes Weybosset Street.

From Points South or from Route 195:
Take 95 North to the Broadway exit #21.  Turn left.  At the next traffic light turn left and proceed through 2 traffic lights and at the 3^rd traffic light turn left onto Broad Street which becomes Weybosset Street.
 

Walking Directions from Providence Station (Amtrak):
Exit the train station at the State House Exit, you will be facing the Rhode Island State House, and to your left will be Providence Place Mall (you'll see The Cheesecake Factory and Nordstrom). Walk towards Providence Place Mall, and then turn left onto Francis Street, walking towards downtown Providence. Walk towards downtown, and cross Memorial Blvd (the Marriott will be to your left, and the Westin Hotel to your right. The next street you will cross is Exchange Terrace, as you walk towards Kennedy Plaza, on Dorrance Street. Walk past the Biltmore Hotel, across Washington St., and then past City Hall (on your right). Keep walking, across Westminster St. At the intersection of Weybosset St., turn right. You will walk up a few blocks and see the PPAC to your left, #220 Weybosset Street. Many people do make the 10-15 minute walk (it's just less than 1 mile), though some prefer a cab.