One of our favorite places and very close to the city. Taking the gondola up costs about $55 Canadian return but the views and things to do up top are worth it. The adventurous types can do the Grouse Grind hike - basically a 2 hour step master machine - to burn off some pre or post wedding calories.
Granville Island is a peninsula and shopping district in Vancouver. It is located across False Creek from Downtown Vancouver under the south end of the Granville Street Bridge. The island has multiple theaters with live performances as well.
Definitely one of the most beautiful places in Canada. In October the lakes are just about to freeze so you can get beautiful reflections of the majestic mountains of this pristine national park. From Vancouver you can take a plane to Calgary where a car rental can take you to the national park in about 1 hour. Alternatively you can drive from Vancouver for about 10 hours to get to Banff. You can hit up wine valley Okanagan on the way!