The best way to get around Hanoi is by walking or taking a taxi. Taxis are affordable and widely available. Just make sure to agree on the fare with the driver before getting in. Depending on your starting location and where you want to go, expect to pay between 15,000-50,000 VND (~ $0.65-$2.20 CAD) per ride.
If you have more time, consider visiting Halong Bay for a stunning overnight cruise, or travel south to Hoi An for a charming historic town experience. If you have less time, consider skipping the Ho Chi Minh Mausoleum or the Old Quarter.