I agree with Oomis. There are many great things we can enjoy, such as seeing the beautiful ocean, and a mother happy with her kids, and listening to a great violinist, etc.
The best eitzah I have found for fighting the yetzer hara is that we must remember that many people are suffering. If we waste time, we may have blown a chance to do a chessed, or cure cancer, or visit someone in the hospital.
We should get into the mindset that things that are asur are not asur to torture us, but because they will not make us truly happy. True happiness comes with accomplishment.
Also, many issurim can be viewed as helping us to realize the plight of the less fortunate. We fast on Yom Kippur to remember the hungry. We keep taharas hamishpacha to remember the singles. We keep Shabbos to be able to spend time with our family without having to worry about business.
Of course, no matter what eitzah you use, the yetzer hara is always a tough guy. But it’s easier when we realize that the Torah wants us to have a good life, not to make our lives miserable in this world.