The Church of St. Nicholas - Cavtat

Beautifully positioned to look out over the waterfront, the Baroque Church of St. Nicholas has a welcoming facade of solid, pale gray stone. 
Reached by ascending a series of widely spread stone steps. St. Nicholas has a decent amount of artwork by notable artists which would be worth your time to see. 
Icons of St. Nicholas, and an alabaster relief from the 15th century; works by Benedetto Genarri, and paintings by Sicilian painter - Carmelo Reggi.
Croatian painter Vlaho Bukovac also has important artwork here and is another good reason to visit.

The Elafiti Island

Kolocep, Lopud and Sipan are the major islands comprising the chain of Elafiti islands between the Pelješac peninsula and the Lapad peninsula. Their name derives from the ancient Greek word ‘elafos’ meaning deer. These islands were once places favored for the summer residences of the Dubrovnik aristocrats.

The three most well-known islands are Kolocep, Lopud, and Sipan and each has treasures  to explored: caves, ruins of fortresses, churches, monasteries. 

Taking a day cruise to one or all of the ELEFITI ISLANDS perhaps should be one of your "must see" attractions. Altogether the Elafits cover less than 30 square kilometers and are inhabited by fewer than a thousand people.

Kolocep is the smallest and closest of the 3 major islands and is the site of Witches Cave & blue Cave; Lopud, the 2nd largest and most visited island and is 50 minutes by boat from Dubrovnik.

Racic Mausoleum

The mausoleum is the final resting place of the prominent Cavtat shipping family, Racic, and is located in the graveyard of St. Rok. The mausoleum itself was erected in 1921, but the Chapel of St. Rok dates from the 15th century. 

The structure of the mausoleum is architectural notable itself because "The entire structure was built without a single piece of wood, or any other material except bronze, of which the door and bell were made." 

A bronze bell in the cupola bears the inscription "Know the mystery of love and though shalt solve the mystery of death and believe that life is eternal." The interior of the mausoleum contains reliefs depicting the stages of life.