Turn 3G off as you only need it for internet and if you are not using that, you will save on battery power.
You can connect to Wifi if the hotel have it, or in coffee bars.
I have a mifi - a mobile wifi - basically a wireless modem that I can put a local sim card into. If you go on holiday to the same country often, or for a longer period, then it might be worthwhile getting one.
this thing