Watch for ?Potential? interest rate movements to anticipate movements in the C$. If Bank of Canada rates go up, and US rates stay the same, this provides incentive for foreign investors to put money into the Canadian market (better risk adjusted return than prior to the rate change). To invest in Canada, foreigners must buy Canadian currency, putting upward pressure on the C$. The converse is true if the central bank rates drop.
The opposite effect is seen with US rate movements. If the US Fed independently lowers rates, then our market becomes more attractive (on a risk adjusted basis), thus foreigners will sell US dollars, and buy Canadian dollars. This again puts upward pressure on the C$.
Many other factors also affect the dollar, for example after the Bank of Canada recently raised interest rates in Canada because of our economic stability, foreigners were in the process of already selling US$ compared to most currencies. This was mainly because of a dim outlook on the US economy, and because of all of the scandals in the US. Foreign countries however, do not like their rates being too strong (ie Japan) against the US$, because it makes their economy less attractive to business. Therefore, often their central bank buys $US, thus strengthening the US$ against all currencies. This is what happened after the recent strengthening of the Canadian dollar, and the reason why it is back to $0.62-0.63 again.
It appears unlikely that the Bank of Canada will raise rates again in the near future, however there has been much speculation that the US Fed will lower rates. The announcement is due out today, but all indications are that they will not move today, probably meaning that the dollar will not react, or react somewhat negatively if rates were expected to go down in the US.
Also, keep in mind that every $0.01 move in the dollar only means a savings or loss of $10 per $1000. Therefore unless one expects a significant swing in the dollar, or has a large sum to invest, the wait may not be worthwhile.
Hope this info helps for those planning future trips!