Hi Bill ,
Unless you hire a car for the day , you will be contained within the town .
The port is within easy walking distance of the town [ 1-2 km] and takes you thro the old harbour area . The old fort is worth a visit and then stroll up into the old town . Here you will find many cafes / bistros etc . and also the Liston , shops , museum , churches all within a small area . The architecture of the buildings and the narrow streets are worth seeing . The day will soon pass , there is so much to see .