European vacation...how should I train?

[76ers#3]

I'm going to Europe on Friday(Paris, Amsterdam, and Brussels) and was wondering of anyone had any good routines that I could do in my hostel room. I won't be in hotels, just hostels so there won't be any gyms. I plan on running for 25-30 minutes eadch morning, but I need a good routine to build muscle with no actual weights, besides push-ups and various ab exercises. Thanks for any replies!