On foot
Many of the main attractions are within walking distance if you get a hotel that is near the Falls, and the rest are easily accessible by transit.
During the busiest tourist season May - October, the Niagara Parkway and Queen Victoria Park, (http://www.niagaraparks.c...) along the Canadian side of the Falls, can become very crowded and finding a "picture perfect" view of the Falls can be hard to do. Walking to the attractions can also be slow during peak tourist season with thousands of people bustling by.
By bus
The WEGO, (http://www.niagaraparks.c...), bus system runs on the Niagara Parkway along the river from May to October. There are stops at all the main points of interest along the parkway. One-day pass: Adult 13 years and over: $7.00, children 6-12 years: $4.00, children 5 and under: free. A map of WEGO stops is available online (http://www.niagaraparks.c...). WEGO passes can be purchased from any of the Welcome Centers see "Understand" above for locations.
The Falls Shuttle, (http://www.niagarafalls.c...) PDF, is operated by the Niagara Transit Commission and has routes covering the Lundy's Lane and River Road districts. Tickets and day passes available at most lodgings, the bus terminal or from the shuttle bus driver. All-day pass $10. Single-ride paid in cash is $3.50.
There are also several tour services that offer the option to buy a hop-on hop-off pass, which allows you to board any of the tour buses at any stop point thoroughout the day.