Childhood friend / Visiting Toronto one day

This Christmas I got to see one of my oldest girlfriends. She looks great! She's living in Toronto. We see each other maybe twice a year if lucky. This time we went two years without seeing each other but that was because last Christmas I was in Philadelphia with my parents, my dad was having proton therapy and she didn't come down this summer to visit instead her parents went up. I was thinking I would like to go to Toronto this summer and visit with her. Never been downtown Toronto ever before. Do you think its better to travel by bus or train? Where would you visit while staying in downtown Toronto? My friends mentioned Scarborough beach... let me know what you think.