Things to do in Vancouver besides play video games in a large house:The aforementioned Bard on the Beach
Museum of Anthropology if you are interested in learning about the native culture of B.C.
Stanley Park - It's mostly just an absurdly beautiful place to walk/jog/bike
Vancouver Aquarium - If you love adorable animals
Vancouver Art Gallery - I've never actually been here so I'd be up for visiting
Granville Island - Pretty touristy but enjoyable and has a fish and chips place literally on the dock which is great
Dr. Sun Yan-Sen Chinese Classical Gardens - A Chinese style garden in Chinatown
Kits Beach - It's a nice beach and not too far away
Queen Elizabeth Park - It's a really nice park really close to our apartment
Beatty Biodiversity Museum - Has a huge ass whale skeleton. For science nerds.
Richmond - It's a suburb of Vancouver with a large Asian population. It will probably be a cool place for the Nius and Nephs of the world and I'm sure will fill Neph's request of Japanese karaoke.
All of these places are accessible by public transit.
Places to visit if you wanted to book a longer vacation:Victoria (the capital city of BC)/Vancouver Island - It is accessible only by ferry (which is quite a beautiful ride). The city has a very strong British influence compared to Vancouver which has more of the Northern Pacific feel. There is a very British fancy hotel called The Empress that's really fun to stay in, and you can have fancy high tea if you hate your money. Much like Vancouver, it is very green in the summer.
The Interior - About three hours outside of Vancouver is the lower-lying Okanagan Valley. There's mostly wineries and other such things in the region, so if you were interested in being a wine snob, this is the place to do it.
Mountains - If you are into hiking, there are tons of mountains in the area, including the mountains that hosted the Olympic events here in 2010. Whistler is a bit of a trek and pricy as fuck, but Cypress, Seymour, and Grouse are all pretty close. The Grouse Grind is a hike that a lot of people really enjoy (or you can just take a gondola up the mountain).
Sechelt - Our favorite place, it's a small community only accessible by ferry. It has lots of beautiful sites, including the spectacular Skookumchuck Narrows, a rare place with large tidal rapids just randomly inside of an inlet. Smuggler's Cove is one our favorite relaxing nature walks. Elf's parents have a house there, so if we suck up to them they might let people stay there.
Food in Vancouver: Heavily Asian. Chinese and Japanese food are two things cited by most people as Vancouver's strengths, but I'm personally pretty fond of Indian and Thai food. You can find whatever you want, though.