Valletta is a very small capital and you can walk from one end to the other in about 15 minutes.
Spend your time strolling around the narrow streets. It is impossible to get lost because all the streets are on a grid system.
It is well worth visiting the St John`s cathederal --- very impresive.
Also make sure to spend some time in the Upper Barakka Gardens with the fabulous views over the Grand Harbour. One of the best views in the world.!!
You will find lots of nice cafes and bars for a coffee , tea or a beer.
Lots of places to eat.
There is lots to see and do in Valletta .
The War museum , the Archeological museum , Art gallery and much much more.
Sure you will enjoy your visit.