Just enjoy your holiday mate, I went trekking in Nepal, north of India last year and the last thing I cared about was my muscles shrinking. I just enjoyed being in a totally different place and environment.
Just enjoy seeing a new culture, new landscapes etc. I lost a lot of muscle when I went away, due to high altitude trekking, and came back really enthusiastic to hit the gym after my experience of a lifetime.
I think what you mentioned are good exercises to keep you fit and conditioned on your holiday, for biceps perhaps find a tree branch or something and do close grip chins, pullups etc. They give the biceps a good hammering,
Or perhaps if you have packpacks with a handle, do some curls with that and put in your posessions to increase resistance.
Do pushups with your feet raised, they make them harder so it effectively gives your chest, delts and triceps a good bodyweight workout without excessively high reps which is common with pushups.
But seriously, I think you will be caught up with the excitement of travelling in a new place to worry about your muscles, thats what happened with me anyhow.
good luck, and have a great trip
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