http://www.arenamaps.com/arenas/Ontario.htm

Among them, I noted several close to Waterloo:

• Mc Cormick: 500 Parkside Drive (519-885-1700) (NO RENTING)
• Columbia Ice Arena: (519-888-4567x5820) (NO RENTING)
• Moses Springer: 150 Lincoln (519-884-5363)
• Rink in the Park: 99 Seagram (519-884-6430)
• Waterloo Memorial: 100 Father David Bauer (519-886-1177)

I seem to have trouble finding an ice skating rink where people can rent ice skates...