I started thinking of all the fantastic hikes in the Lower Mainland that I've been on and I thought I'd share a couple that I've been on. (note: The Grouse Grind does not count as a "hike." It it more accurately termed a barbarous stair climb up the face of a mount to get to the top of a gondola.)
I'll upload some of the pictures I've taken of these places when I get around to it, but I'll start the thread off with one place I've been:
Mt. Cheam Peak.
You need a truck or a car with a lot of clearance to get to the base of this trail, and a 4x4 is preferable, but this is one hike that you must do at least once. On a good low-pollution day, you can see to the Ocean and further one way and Jones Lake the other.
The hike takes from 4-6 hours roundtrip from bottom to top. With lots of breaks, you'll be around 3 hours each way, with people who have never hiked before.
More info
here.
The View is further enhanced by the fact that you climb up the back-side of the mountain for almost the entire way and it's only when you get to the very peak that the whole Fraser Valley opens up beneath you. Litereally, it takes your breath away. To add to this, you hike a lot of the trip through alpine meadows and there's a little lake at the bottom to cool off in when you're done the hike.
From MT. Cheam Peak to its sister Mountain, Lady Peak
Looking North-west Across the Fraser River at Agassiz
Chilliwack, Looking West across the Fraser Valley
Images from here