Cardiff - 1 Day - (breakfast) > Cardiff Castle > (lunch) > Natl. Museum & Gallery > Millennium Stadium > Bute Park > Cardiff Bay (dinner) > waterbus from city > local pub
Cardiiff - 2 Days - (breakfast) > Cardiff Castle > (lunch) > Natl. Museum & Gallery > Millennium Stadium > Bute Park > City Centre (dinner) > (breakfast) > Llandaff Cathedral > Castell Coch > Caerphilly > Cardiff Bay (dinner) > local pub
Cardiff (Lonely Planet) - Cardiff Castle ($, http://www.cardiffcastle.com); Welch Regiment Museum; National Museum Cardiff ($0, http://www.museumwales.ac.uk); Millennium Stadium ($, http://www.millenniumstadium.com); Bute Park/Animal Wall; Waterfront - Mermaid Quay Restaurants & Shops; Wales Millennium Centre, Bute Pl. ($0, http://wmc.org.uk); Senedd Natl. Assembly Building ($0, http://www.assemblywales.org/sen-home); Pierhead Museum ($0, http://www.pierhead.org); Doctor Who Up Close, Red Dragon Centre ($, http://www.doctorwhoexhibitions.com)
Around Cardiff - Penarth (resort); Barry (resort); St. Fagans Natl. History Museum ($, http://www.museumwales.ac.uk/en/stfagans); Castell Coch, Tognwynlais ($); Caerphilly Town & Castle ($)