Climb at Lighthouse Park after work. There is good quality bouldering (starting from V1) 7 minutes walk from the carpark. Lighthouse Park is a 15~ minute drive from St David's. Please bring a headlamp to be able to climb a bit as it gets dark. There is also top-roping at Lighthouse Park - feel free to join the trip if that's your game.
To get the most out of the trip, you will be able to cleanly second/TR 5.10+ climbs outside or have bouldered at least V1 outdoors before (this is not a requirement though :) )