Don't be sorry, ask as much as you want
For work experience I did 2 weeks in a cat rescue shelter and 2 weeks with the East Sussex Wildlife Rescue and Ambulance Service (i.e. 2 weeks with domestic animals and 2 weeks with wild animals) and then linked this to looking at their behaviour, their ecology etc.
Something like that is quite good. It depends what area you want to go into. I'm going down the evolution route. If you like microbiology or biochemistry get some lab experience.
It shouldn't be awful that you don't do too much extra curricular stuff. If you just have one thing that should be enough (if you can link it to skills that would be useful)