There are hotel gyms but I can't seem to get used to that type of exercise.
Get used to it! Get an ipod (I think that's what they are called) for entertainment.
I found that 45 minutes on a treadmill and 20 minutes on a cycling machine every day had a beneficial effect while I was on holiday in the Caribbean recently (very 'ot, very 'umid, very all-inclusive). The gym was airconditioned, thankfully. If there had been a rowing machine I'd have used that as well / instead.
Otherwise swim 1 Km in the pool (that's 40 lengths of a 25m pool).
It does help to do any and all stomach muscle exercises, whether in the gym or not. Helps your back AND your figure.
I'm trying to get back to 12 stone (76 Kg) from the giddy heights of 15.5 (100 Kg)!
I reckon it will take over a year of walking 4-5 miles a day. But I have already lost nearly 2 Kg in the last month. So that's a start.
SD