Ideas for exercise while on vacation

Power walking, push ups, sit ups, alternating or walking lunges across the room, jumping jacks, etc. I'd just write down 4-6 exercised to do, like the ones listed, and then do 3 reps of 20 or 30 each plus a walk/run every other day.

There are plenty of body weight exercises that you can do just about anywhere. You can google at home workout for several ideas but here are a few off the top of my head:

Push-ups, squats, tricep dips (just need a chair or low table), leg lifts (several positions), sit-ups, plank

You could even do some low weight high rep bicep curls, shoulder presses and the like with your hair dryer or shampoo bottle.

I downloaded a free DVD player on my laptop and take my exercise DVDs along with me whenever we travel. Jillian Michaels' Banish Fat Boost Metabolism and her 6 wk 6 pack require no equipment (although weights are optional in workout 1 of the 6 wk/6 pk, nor do any of the Insanity workouts. You also don't need much floor space for these DVDs.

Most of what has been suggested does not sound fun for a holiday!!!! L)

depends on where you are going really. One of my favourite things to do and many European cities you can do this as well as country places, is hire a bicycle and see the sights on a bicycle. Lots of fun , you could pack a lunch and do that all day.
Swimming if you are near a beach or pool
hiking (as opposed to strolling!)
Just I guess in stead of concentrating on eating and drinking on your holiday look for the active fun to be offered whereever you are, even if its trying a new sport or something. Kayaking is anotehr good one, at the beach or river or lake.
Exercise does not have to be actual workout plans and things the important thing is keeping an eye on your portions, your alcohol intake and keeping active.

There are a whole bunch of free and not free apps with workout routines.

Good Idea!