One of the most difficult things a casual athlete encounters in his or her training is coming back after vacation. This happens because the training pattern gets broken, and the "habit space" gets filled in with other activities or habits.
One of the most effective ways to stay on track is to move or train on the same days you are used to, when at home.
It doesn't have to be a big, long workout. As long as it gets your muscles worm, heart rate up, and your routine going, it's enough. You can go for a jog or even a long walk. What is even better: you can do a simple fun bodyweight workout: that will be enough to maintain your pre-vacation results, and stay on a good track.
Below is a list of Daily Home workouts, which you can do anywhere.
Remember - we are all slaves to our habits - might as well use that to your advantage, and get "enslaved" by the good ones :)
Have a great summer, and enjoy the workouts!