I was there in February for 2 days. We managed to get to Stanley Park which was gorgeous in the middle of winter, I can just imagine what it looks like now

Also check out the aqarium if you're into cute shit like I am
If you're short on cash, just walking on Robson or over to Granville island is interesting, lots of window shopping.
And if you're looking to avoid the bums and crack heads, steer clear of gastown/chinatown at all costs!