There are a bunch of ideas you can do. Varied and regular multiple types of bodyweight exercises. pushups (wide grip, close grip, elevated, handstand pushups, etc), Squats (pistols, tuck jump squats, dumbell squats, lunges etc), not to mention so many different varied exercises that are out there, planks, dips, jumping jacks, burpees (multiple variations of these such as bends and thrusts, pullup burpees, burpee tuck jumps, burpee squats, barbell burpees, etc). The realms of possibilities are almost limitless. Ultimately since you are in a temporary situation and unable to change much as far as physical environment the question is what do you want out of it? If your goal is to maintain your current level of fitness I would do regular sets of X number of reps daily with a varied amount of exercises. If your goal is to get better at something or improve something (it appears you like the idea of one-arm pushup and pistols) I would work specifically in that arena while you're in that situation. For example you could start a level one day one of 1 one-arm pushups (or progressions) and 2 pistols (or progressions). A L1D2 of 5 rnds 2 one-arm pushups, 6 pistols etc. For fun you mix another exercise into it.
You could do tabatas in any way you wanted e.g 1 tabata 3 cycles of 1 min work 10 sec rest of:
jumping jacks or box jumps or tuck jumps or jump rope
Personally I would mix it up and be varied as to reps, rounds and exercises done or I would do a strict regimen of a specific type of workout with a goal of beating the previous workout. I guess it depends on what you want really. Hope this helps.
"Permanence, perseverance and persistence in spite of all obstacles, discouragement, and impossibilities: It is this, that in all things distinguishes the strong soul from the weak”