For me the best highs are, in order:
1. Laying down in bed when you havent slept in forever
2. Quenching your thirst when you are incredibly thirsty.
3. Jumping in a pool when you are hot.
4. Warming up when you are cold
5. Sex
6. Eating when you are really hungry.
7. Pissing when you have to go really bad
8. Dumping when you have explosive diarrea
The order is up to discussion but i think this is a good starting point