I just returned from a relaxing trip to the Bahamas.
A lot of people see vacation as a time to throw caution to the wind, become sedentary, and eat obscene quantities of food. I see things differently.
To me, vacation is a time to unwind. But, because exercise makes me feel good, I keep it up. I tone down my routine, but I still exercise in some way on most days of a vacation.
I do a lot of running on a vacation. I find that running is a great way to explore the local sights. Another favorite workout is running barefoot on wet sand. I go barefoot, and I run along the beach just where the waves touch the sand. It's a little more challenging than running on trails and works different muscles.
I found another triathlete physician, and he put me through the paces of his own workout. It was fun for me, because I always love a challenge. We did intervals of ten minutes alternating on the bike and on the treadmill, and did a total of six intervals, followed by a brief swim (yes, me, voluntarily swimming in the off-season) in the ocean.
On vacation, the bottom line to exercising is to keep it fun.