When you reach TBS, you can visit the following places.

Royal Selangor Visitor Centre: If you admire arts and crafts, Royal Selangor Visitor Centre is the perfect place to visit near TBS.
Petronas Twin Towers: It is a skyscraper (twin towers) in KL that attracts people worldwide.
Aquaria: Aquaria KLCC is an underground oceanarium that incorporates more than 5,000 species of organisms.
Islamic Arts Museum: Ancient books and murals at the Islamic Arts Museum will help you learn a lot about the Islam religion.
Perdana Botanical Garden: Perdana Botanical Garden will offer you a sense of tranquillity away from the city rush of KL.
KLCC Park: It is a perfect place around TBS to spend time with friends or family.

Bus From Kuantan to TBS (Terminal Bersepadu Selatan)