Try new things
Do not be afraid to do new things or visit places you have never been before. Try something completely different and even go out of your comfort zone. Jump with a bungee, or go to a safari. Others usually come back in one piece from such adventures and so you will. If you are not an adventurous, you can simply take on a new hobby.
Do things you love
Do not let anyone tell you how to spend your summer holiday. If the majority of people are heading to exotic locations for a vacation, do not do the same just because everyone else is doing it. You may prefer to just stay at home or visit some of your closest friends and relatives. Do only the things that will make you happy.
Doing nothing during your summer holiday is a waste of time only if it lasts for too long. If you spend your entire vacation in blissful inactivity, there will really be no point in taking a holiday at all. But you can afford to do absolutely nothing for a day. In fact, you must. This will help you catch your breath, clear your mind, relax and gain back your focus.
Have fun enjoying the happiest summer of your life by breaking or making your own rules.