Great nightlife in Vancouver and nearby islands and canyons to day trip to. Definitely check out Lynn's Canyon (I think?) if you have time and Stanley Park, with its beaches and greenery, is a great way to pass a chilled out afternoon.
Insider Tip:Give Granville Island a miss unless you're dead set on it. Stay at Samesun Backpackers and they'll offer a bunch of daily activities (some free) which are a great way to get to know the city and to meet other travellers.