Would it be a good idea to rabbit-proof my garden?

I have got two rabbits who live in a two tier hutch with a pen attached. The pen is 4 ft by 4 ft. I let them run round the garden supervised for half an hour or so a day. But Ive been thinking would it be a good idea to completele rabbit-proof my garden so that they can run round for longer (when Im at home). I cant help thinking it must be a terribly boring life for rabbits cooped up in a pen all the time.
 
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