The advice given to simply enjoy yourself in France might fly if you're little more than someone trying to be the hero at the weekly company softball game.
However, you state you're a college baseball player. And your user id futurekoufax tells me you have Big League aspirations.
So flush the notion of 'taking it easy' down the toilet because that's where it belongs.
I god damn guarantee you: as you're reading this post, there's a guy somewhere who is just as young as you, just as talented as you, but he's working harder and smarter than you.
This is the guy you'll have to compete against in college.
This is the guy you'll be compared to in the draft (if you're good enough).
And this is the guy you'll go up against through the farm system as you work your way up to The Show.
So I suggest you make the most of your time there.
First of all, don't slack off in class. Studying abroad has its many distractions - I remember my undergrad days.
Secondly, do something that will help you progress as an athlete and a ball player while you're there.
And then you can enjoy France and all it has to offer. Trust me - you'll have plenty time for this AND you'll enjoy it more knowing that you've put in the work as a student and an athlete.
So what can you do based on your current situation...?
A typical one-gallon jug with handle will weigh a little over eight pounds. If you apply yourself, you'll be surprised how many productive rotator cuff exercises you can do with that. I don't have to tell you how important it is to keep that throwing arm healthy.
And the mmc and overall knowledge you gain with just a couple of eight-pound weights will absolutely transfer over when you return to the states and hit the iron.
And instead of just push ups, which can aggravate the wrist and possibly elbow (you have to think long-term health here), I think you could do worse than that old infomercial stand-by: the Perfect Pushup.
You can order it online, get it in a few days, and it takes up very little space. In fact it's inexpensive enough that you can even gift it to a friend if you don't want to take it back home.
It keeps your wrists in a neutral position and allows just enough movement to reduce torque on the elbows.
Just remember - you DO NOT have to go through the extreme rotation like you see some people do. As long as your upper arms are at about 45 degrees (imagine your left elbow pointing at around seven or eight o'clock and right elbow pointing about five or four), plus or minus a few as you go through the rep, you'll minimize the risks.
And if you don't think the lowly push up can't put on or help retain mass, try the following. After warming up, use a controlled tempo (2 sec down, 1 sec pause, 1 sec up), do NOT lock out elbows at the top, and do as many smooth and precise reps as you can. Rest 1 minute. Then repeat the process for 45 minutes. You'll notice at some point, the max reps in one set will peak and then it'll gradually diminish. Write down the total number of reps completed.
Take a rest day or two.
Come back, warm up, do it again and try to beat that previous rep total. But DO NOT sacrifice form to get there.
That's just one variation among many.
If you decide to order the perfect push up, get some bands (as another poster mentioned). With thin bands, you can add more rotator cuff exercises. With thicker bands, you can perform band-assisted one-legged squats, pallof presses and variations, band assisted one-arm push ups (because it's important to work your non-throwing arm).
All these things - if you actually apply yourself - will establish a solid foundation for when you actually return to the gym. Furthermore, it'll help you become more accomplished at creating and performing exercises with minimal equipment. How's that for an education?
And there are countless more info but I'm growing a little bored right now.
Just remember what I said earlier about the guy out there who is just as young, just as talented, but who is working harder and smarter than his competition.
Do you want to be that guy or the one going up against him...?