For lower body, many unweighted exercises will work very well: lunges (like walking lunges across the room), squats, jump squats, plyo scissors. After a warm-up, you could do a set of squats, followe by a set of plyo squats, for example. You could also do some kickboxing kicks (especially back kicks) for some lower body and cardio.
Also, take advantage of opportunities to walk as much as possible, like when exploring the sites.
If you are staying in a hotel, you could also take advantage of th weight room. And/or climb stairs (take the elevator down---easier on the knees--then take the stairs to the top floor and repeat a couple of times).
(A small request: could you start using more punctuation in your posts? It would make them easier to read, and being at bifocal stage in my life, I need as much help as possible! ;-) TIA! )
:+ 
