There are plenty of days at the zoo that are of inferior quality to days hanging around mucking about at home.
Day at home might include: making biscuits, spilling drinks, getting shouted at, having cuddles, snuggling up to watch telly, dressing up, hiding mummy's contact lenses and getting shouted at again, being kissed, running around shouting, doing some dancing in the kitchen, drawing vehicles, making lego, helping hang up the washing, heling put away puzzles, pretend tea drinking, making a den with old sheets, smushing hands around in paint.
Day at the zoo might include: daddy passing out at the price of the tickets, argument over helium balloons, selling a kidney to purchase huge helium balloon, balloon flying off into space and child having emotional breakdown, looking for the nearest loos every 20 mins, taking too long finding them and having to buy long T-shirt to cover lack of pants and trousers, spending your life's savings on food and ice-cream, navigating cunning routes that avoid passing the shop, losing your child, freaking out and finding them happily in the shop with a pile of fluffy anteaters, removing them in tears, trying to make them see the fascination of stick insects, lifting them up to see small beetles, missing most of the animals because they tend to sulk in their houses during torrential rainstorms, being shouted at by mummy for not enjoying it all enough, getting a parking ticket and when you get home mummy realising you have a temperature and the norovirus and would have been much happier under a rug on the sofa watching Madagascar.