My son (4yr old) was just diagnosed with pink eye. What is the best way to give drops to a child who is fighting it.

Any time I have had to give my daughter medicine that she doesn't like - I give her two choices...
1. the hard way
2. the easy way

The hard way is when I have to hold her down and force the medicine. The easy way is when she takes it and gets over it.
I have had to enforce the hard way a couple of times - while it is not "fun" it is effective. I think I have only had to do it twice.

With the eye drops - have a cool cloth ready to put on his eyes when he is done. This may make it a bit easier.

Okay, I found a reference for you ( I'm going to use this myself!)..

A safe, effective, and "less-scary-for-your- child" method of putting drops into the eyes involves asking your child to lie down flat, suggesting she merely "close your eyes" and placing the recommended number of drops in the inner corner of the eye, next to the bridge of the nose, and letting them make a little "lake" there. When your child relaxes and opens the eyes, the medicine will flow gently into the infected mucous membranes without the need to "force open" the eyes.