1. Get enough sleep. A majority of my training is either in the summer or during other warm months, so I like to run earlier in the day to avoid the warmer temperatures. This is why it's important to get enough sleep. Sleep deprivation will negatively impact your run.
2. Increase mileage gradually. Adding too much mileage too quickly is an easy way to get injured. I've heard all kinds of numbers from Runners World and other running sources, but it's important to just listen to your body; it will let you know if you are doing too much too soon.
3. Rest. Overtraining not only can lead to burn out, but it can also lead to injury. All around, it's not a good situation. Give your body enough down time to recover from your last run. If you want to be active every day, incorporate some cross training into your routine.
4. Refuel with chocolate milk. Research has shown that chocolate milk is an effective recovery beverage. Not only does it taste great, but it's a nutrient powerhouse complete with nine essential nutrients. Studies suggest that chocolate milk has the right combination of protein and carbohydrates to refuel tired muscles. I've been drinking chocolate milk after races and long runs since my high school cross country days, and I've noticed a big difference compared to traditional sports drinks.
5. Have fun!! Don't overthink your training. While it's important to have a plan and be prepared for the race, don't forget to have a good time. If you aren't having fun, what's the point?