I mainly concentrate my efforts on making sure I have done my before take-off and power checks properly. This considerably reduces the chances of the engine stopping on take-off.
I trained in Long Beach, CA and most of the time after take-off you just tried not to think about it too much. As there were very few landing sites.
During the climbout I do all the normal things like maintaining airspeed, runway track etc but what I think I should be doing is constantly picking landing sites so that if the engine does stop, I already know where I'm going.
Something like.
1. Runway still ahead, I'll land there.
2. Not enough runway ahead now, but I can land on the intersecting runway.
3. Not enough runway now, I'll go in that field over there on the left.
4. Can't make that field now, so I'll have to use that one etc,etc.
Do this until turning back is a safe option.
I'll give it a go, the next time I go flying.