I'm on the go alot. Are you staying in a hotel? If so, if it has a gym, utilize it! Call your hotel ahead of time to figure out what fitness facilties they have. For example, I was booked in a hotel in London without a gym, found one with one and changed my booking. Its important to me.
Buy your own water, its expensive in hotels. As for wine, I'm not sure, I don't drink a lot, but it may save you from attacking the minibar, go for it.
Going out to eat? Have a clear soup or a soup that isn't cream based as a starter. Worked great for me on my last trip!
Doing car travel? Make sure you pack something that will keep you occupied food wise- don't want to stop at tim hortons too often

.
Flying? If its a meal flight and you actually get fed, request a low fat meal. If its not and your airport concessions are awful as they are in Seattle, pack a non-perishable snack or lunch (peanut butter sammy, carrots, luna bars) to resist the urge for a nice
huge burger and fries.
If its not deathly cold, walk where you would usually catch a cab or bus, you'll love seeing the city at a slower pace.
Have fun!
lala