To help make the most of your stay in the Welsh Capital, here is a list of things to see and do..
 
Cardiff Bay
The old Cardiff docklands have been redeveloped in the last decade to create Cardiff Bay, home to a large freshwater lake for sailing and water sports; the stylish five-star St David’s Hotel and Spa, and Mermaid Quay – a restaurant hotspot with everything from Italian to Turkish cuisine. 

Cardiff Bay Visitor Centre 'The Tube'
The Bay Visitor Centre, also known as The Tube, is home to exhibitions and displays on the history and development of Cardiff Bay, including a scale model of the entire city. (Free entry)

Cardiff Castle
Cardiff may only have been a city for 100 years, but there has been a castle here for nearly 2000 years. Tours of the castle interior take place throughout the day, or visitors can just enjoy a stroll around the picturesque Castle gardens. The newly opened £6m Interpretation Centre will also present for the first time the story of the Castle and its 2000 years of history, offering visitors a unique opportunity to learn about the different phases of the Castle’s development from the Romans through to the modern day. (Full tour: Adult £8.95, Children £6.35) 

Castell Coch
While resting on ancient foundations, Castell Coch (Red Castle) is relatively modern, the by-product of a vivid Victorian imagination, assisted by untold wealth. The Middle Ages fascinated the Victorians as much as the Victorians fascinate us today. High Gothic was the order of the day. 

Doctor Who Exhibition
Get up close to a cyberman and a dalek, and see monsters, costumes and props from the recent series of Doctor Who, most of which was filmed in Cardiff. The interactive exhibition in the Red Dragon Centre also features props from the original series, and a Doctor Who shop. (Entry, Adults £5.50, Child & Concessions £4, Family £16 - 2+2)

Millennium Stadium
When the stadium isn’t hosting major sports matches or concerts you can take a tour of the 74,000 seat stadium. Walk down the players' tunnel, try out the Queen’s seat in the Royal box and discover how they removed the curse from the away-team changing rooms. (Adults £6.50, children £4, book in advance)

National Museum Cardiff
Two wealthy Welsh sisters bequeathed their large art collection to the museum and gallery in the mid 20th century, resulting in Cardiff owning one of the largest collections of Impressionist paintings outside of Paris, with works by Renoir, Monet and Cezanne on display. From March 2009 - August 2010 the collection is on tour in the United States, however a new exhibition (7th March -14th June) presents works by Alfred Sisley, one of the leading figures of the Impressionist movement who was inspired by Wales and its landscapes. Find out more. (Free entry, closed Mondays except bank holidays)

Norwegian Church Arts Centre
The Norwegian Church Arts Centre was first established in Cardiff Bay to serve the large community of Norwegian sailors working in the docks. Its main claim to fame is as the church where author Roald Dahl was christened – today, however, it has been converted into a café and art gallery. (Free entry)

St Fagan’s National History Museum
See Wales in a day at one of Europe's biggest open-air museums. The 100-acre parkland has over forty original buildings, moved from various parts of Wales and re-erected to show how the people of Wales lived over the last 500 years. Open from 10am - 5pm daily and open Bank Holiday Mondays. (Free entry) 

Techniquest
Enter a world of science and technology at Cardiff Bay’s Techniquest, with well over 100 hands-on exhibits with puzzles and activities to entertain the whole family. There are also shows in the Science Theatre and tours of the Universe in the Planetarium. (Entry Adult £7.00, Children & Concessions £5.00 and Family Ticket £23.00)

Wales Millennium Centre
The award-winning Wales Millennium Centre, Cardiff Bay, is one of Europe’s most innovative and vibrant performing arts venues.  It provides a world-class stage for ballet, opera, dance and musicals, along with free foyer performances, tours, exhibitions and a choice of bars and restaurants.

Y Senedd/ Pierhead Building
Visitors to the Senedd - the Welsh Assembly Government’s debating chamber, can join a tour of the eco-friendly building, or watch Assembly debates from the public viewing gallery. Next door to the Senedd is the historic Pierhead Building, which contains an interactive exhibition on the role of the National Assembly.
 
Llandaff Cathedral
Llandaff Cathedral in the ancient "City of Llandaff" is one of the oldest religious sites in the UK. The cathedral dates from 1107, and also features the modernist sculpture by Sir Jacob Epstein- 'Christ in Majesty'. (Free entry)