there is a karting place not far from where you staying, (inside karting)

or there is landow which is outside karting, but thats a minibus ride out of town, paintball is near to llandow, not sure if there is local one.

i know of some off road thing's, near pontypridd, which again is minibus ride out of town

in the bay, you have casino, bowling (not really stagg do though)

jump on a boat in the bay, and it's a crazy ride out to the island in the bay

on the stag doo i did this year, we did casino and drinking in the daytime