Avalanche Lake hike - this is about a 5 mile round-trip hike. It's relatively easy, but you'll have to decide about the distance for the pregnant woman. It's an incredible payoff when you get to the lake and see waterfalls cascading in from what looks like the top of the world.
Hidden Lake hike - This trail begins at the Vistor's Center at the top of Logan Pass. It's a steep uphill hike, but not that far. We usually go to the overlook, then turn around. We've seen mountain goats every time we've done it, and we usually seek bighorn sheep as well.
Many Glacier - this is mainly just a drive up to the Many Glacier area. It's beautiful, with lakes and rivers, and you stand a good chance of seeing bear. We've seen a black bear right by the road, and another time we saw a mama grizzly with 3 yearling cubs.
Take a swim in Lake McDonald - At the Fish Creek campground, there's a picnic area, that goes down to a beach. It's not a great beach (very rocky), but not bad either. If you're looking to cool off after a day of hiking, this is not a bad spot. And, it is chilly, but worth it.