This could be a great thing for you if your use to doin prorammes eg4-6 weeks, the little muddle of programmes over the next 6 weeks will be a good mix up for the body as long as you use the same programme for when your away total of 3 weeks and the same for when your a home just so you have some consistancy otherwisw your body will get to confused with no chance of adaption thus no progresion thus not much in gain.
I myself went to rome for 2 weeks and did full body training with mainly bodyweight and some with additional weight, the trick is to use whatever you can for additional weight, at one point i was using my own suitcase for weight and even the furniture in the hotel room. Here it is.
3 times a week.
Deasdlift with loaded suitcase
bench press used a tablbe for this but you can do push ups.
Sissy squats (doesnt mean your a sissy)
Shoulder press used loaded suitcase
bodyweight tricep dip (between two beds or chairs add additional weight if you choose).
Close grip chins using biceps negative only (OUCH)
Single leg calf raises with additional weight in opposite hand.
Lying hyperetentions.(Lower back)
There you go a full body workout 3 times a week, its not a split because your on holiday and your nutritinal levels may go down and alcohol levels may go up, saying be as intense as you wish, ill leave it to you to pick your sets and reps and rest times.
This programme should certainly maintain what you have a maybe een give you ore gain, the thing to remeber is that its diffrent and the body like diffrent things weather it be weight reps,sets,rest.
Hope this all help anything further give post me.