Some travelers have mentioned that the T9 bus service operates from Cardiff city center to Cardiff Airport, running every 20 minutes until 23:50, at a cost of 5 pounds. Additionally, the 905 bus connects to Rhoose Railway Station for train access, although trains run only once per hour.

According to forum posts, there is a shuttle bus that transports passengers from Cardiff Airport to Rhoose Railway Station, where travelers can catch a train. The train runs up to 23:13 on weekdays, and the bus service to the station is frequent enough to allow for timely connections.

For those looking for direct routes, some users suggested taking a taxi or booking private transfers, especially for late arrivals or when public transport schedules are less convenient. Information and booking for taxis can be found on the official Cardiff Airport website.

Some travelers recommended the Park Plaza due to its proximity to Cardiff Castle and its amenities like a spa and pool. The Hilton and the Mercure (formerly Holland House) were also mentioned for their central locations and pool facilities, although the Mercure was noted for potential traffic noise. A few users preferred the Radisson for its central location despite lacking a pool, highlighting its convenience for accessing shops and restaurants.

For those looking for a more unique or budget-friendly stay, the Nos Da and The Riverhouse were suggested, known for their central locations and proximity to nightlife, suitable for younger travelers or those interested in pub crawls. Additionally, the Indigo Hotel was praised for its decor and comprehensive amenities, despite not having a pool.

It was advised that staying in the city center is more convenient for accessing major attractions and transportation links. Some users specifically noted that while Cardiff Bay offers nice views and attractions, it generally requires more travel time to reach the central city sites.

According to forum posts, popular activities in Cardiff include visiting Cardiff Castle, the National Museum, and Bute Park. The Victorian shopping arcades are also recommended for their unique shopping experience.

Some travelers suggested exploring Cardiff Bay, where attractions like the Millennium Centre and the Senedd can be found. A scenic water taxi ride down the River Taff to Cardiff Bay offers a novel way to see the city.

For those interested in culture and history, St Fagans National History Museum and the Principality rugby stadium are top recommendations. Additionally, travelers have called out Tredegar House and Castell Coch as must-visit historical sites.

For outdoor enthusiasts, cycling is a great way to explore the city. Cardiff's flat terrain and improved cycle network make it accessible for biking around main sites like Cardiff Bay and along the Taff Trail.