Climb at Cypress Falls park after work. There is good quality bouldering (starting from V0) and sport climbing (starting mostly from 5.10), and some trad (starting mostly from 5.9) all a short walk (60 seconds~ to 10 minutes) from the carpark. Cypress Falls park is a 10 minute drive from St David's.
To get the most out of the trip, you will be able to second/TR 5.10+ climbs or have bouldered at least V1 outdoors before (this is not a requirement though :) )