Yes I know, not the first thing you would think about when you have the day off and don't know what to do, but feeding an animal is one of the coolest and one of the cheapest things you will ever do, and an echidna being that just that little bit abnormal then the average animal just makes it that one bit cooler.
I went to the wild life centre in sydney for this which if you have not been before it is easily a must see, it has a walk in section were (you guessed it) you can feed the animals, is right next the the aquarium,
Which omg the animals are just stunning and beautiful.
but honestly look around yourself, go for an adventure,
I'm sure there are other places around were you may find something just as cool, you just have to look,