Authentic experiences are great, but I would prefer to mix it up a bit. Give them some authentic experiences some days but go ahead and give them some worksheets on others. And I would be careful to avoid any kind of assignments that require parental involvement. All too often we use our own experiences as parents to try and set classroom policy, but not every kid has the same family support. Pretend every kid in class has little parental support and adjust your assignments accordingly., trips to the market are probably okay because every family buys food. At the same time, don't go too far in the other direction and dismiss homework entirely. Kids need a modest/reasonable amount of homework for their own development.