What's the best way to treat someone I love who has a terminal illness?

It's my dad. He's got stage 4 lung cancer. We knew he was going to die anyway (diagonsed 3 months ago) and the doctor said he only has a few months left (less than 6 months). I only want to give him the best time he has, how can i do that with such a short time left?<br><br>TLDR: My dads dieing I want to give him a good time