Sometimes all I've got is 30 minutes to get a great sweat in. Sometimes that means a distance run, other times I go for a HIIT workout to really raise my heart rate for the rest of the day {{hello, increased fat burn}}!!
Here is a great workout that I did at a soccer field, on the grass. I also always have 3 bands with me whether I am at home or travelling (in this case I was in florida) this way I could get a little strength training in during my "active" recovery.
Running/speed work:
10, 20, 30 yard shuttle--SPRINT -- as fast as you can. Mark off 10, 20 and 30 yard markers and sprint to the 10, and back, the 20 and back, and the 30 and back!
Active recovery:
8 Pushups
15 band spread aparts (red bands)
10 curls (black band)
10 upright row (red band)
8 broad jumps (4 down, 4 back to where you started)
Wait 30 seconds and repeat!! I usually aim for 8 sets but workout can be adjusted to your strength and endurance levels including amount of reps and rest time.
Good luck!