Fishing the lakes in the Squamish area during the summer months can be difficult as the trout tend to be less active. Spring or fall is your best bet. Alice lake use to produce several fish in the 10 - 12 inch range. It has plenty of shore access and even a dock. It wasn't uncommon to hook several dozen trout during a nice cool spring or fall day. The trout are quite gullible and popular flies such as spratelys, careys, halfbacks, leeches and the like are a good bet. Spinners (e.g. panther martins) and bait (e.g. worms) also will hook fish.
Unfortunately, Alice Lake's fish stocking was substantially reduced last year - and I have no idea why. Considering it is the most popular lake in the area, I would think that fishing would be a great opportunity for family fun. It's a great place for kids to learn and catch fish, considering the shore access and general ease of catching the trout.
On the other hand, I agree that Alice can be quite busy with lots of family activities, other than fishing, going on! There are other more secluded lakes in the area. Stump lake is the closest lake and is a short hike from Alice. Shore access is limited, however, so I'd recommend a water craft such as a float tube. Edith is also in the vicinity, though I've never fished it.
Good luck and have fun!
