Summer stuff for a 13 y/o girl to do?

hi im 13 and now that the holidays have arrived im bored. im an only child and my mom is at work until 6:30 every day. i live with my mum granny and grandad on a farm i dnt live near any of my friends and i obviously cant drive o what could i do??? the only thing i can think of is go on the computer!!! i like to be outside better that inside and its not that hot here cos i live in ireland!!! please help!! what could i do outside or inside during the summer on my own?????