Better odds of catching a moose than a fish.
This is an easy and relatively flat hike that is less than a mile from the Swiftcurrent Motor Inn parking lot.
The 12-acre shallow, clear glacial lake is fairly scenic with Mount Grinnell to the south and Mount Wilbur to the west. The big attraction here is moose. If you get there early enough, you're bound to see a bull moose and maybe even a group of moose feeding on the grass in the shallow areas of the lake.
There is a mildly steep section less than a half-mile from the trailhead. The hike takes you through a pine forest and then there is an inconspicuous sign on your left that leads down a path to the lake. You could continue walking on to Red Rock Lake and not even know you were passing by Fishercap Lake.
If you're lucky, you'll get to see a moose. If not, just soak it up for a bit before continuing your day.
If you're an angler, you'll need waders. There are lots of small brook trout for your dinner.
Last, remember this is bear country so keep that in mind.
The NPS does have guided tours that come out to Fishercap Lake. It could be the Early Morning Bird Walk, the Wildflower Walk or the Nature Walk. You can check online before you go or check at any of the hotels or visitors center ranger booths.
WARNING! Hiking and outdoor related sports can be dangerous. Be responsible and prepare for the trip. Study the area you are entering and plan accordingly. Dress for the current and unexpected weather changes. Take plenty of water. Never go alone. Make an itinerary with your plan(s), route(s), destination(s) and expected return time. Give your itinerary to trusted family and/or friends.