We go fishing during the Summer up to Aberthaw near the airport. Theres a nature reserve which you walk thru to get to the fishing mark.
I thought it was strange when I saw a signs warning you about not wearing shorts or leaving your legs exposed..turned out theres a massive viper/adder population there.

I must be honest tho', I do find it a very good area for practising your 100 yard dash during the athletic season..