Pack some necessities and motivational snacks along the way: backpacks and additional water bottles, toilet paper for going off the trail, bear spray (we didn't see any as this is a pretty busy trail thankfully), trail mix, picnic lunch, rain jackets for all, treats for motivation to get up the mountain (for some this was Skittles, for my son with special needs, it was an iPad turn at the top).
Check the weather for sure and don't do this hike if it is supposed to storm. Even on a partly cloudy day it can sprinkle up on the mountain, so be prepared.
This will take you all day with kids, especially if they happen to be as young as ours or have special needs. It was totally worth it, but it's a strenuous hike, even for adults. Try to get to the trailhead and leave no later than 8:00 a.m. if you are hiking with kids. For adults, the park info says this is a 7-hour hike (10 miles or 16km total) and with younger kids, it took us 9 hours.
This hike would need to happen in milder weather months as the Teton Park Road is closed November through May.
Getting up into the mountains at Grand Teton with kids is a must. The Surprise and Amphitheater Lakes hike is a test of endurance at 10 miles roundtrip. However, the serene lakes at the top are a wonderful reward. Begin at Lupine Meadows Trailhead and head to the Surprise and Amphitheater Lakes Trail. Although long, this trail is fine for kids elementary age and up. It is not terribly steep and doesn’t have sheer drop offs. For most families, this will not be the kind of thing you want to do every day on your trip. For us, it was the one strenuous hike we did all vacation. Prepare well for it and it will be a highlight for all involved. Afterward, grab ice cream and relax on the rocky shores of Jackson Lake at Signal Mountain Marina; a well-deserved end to an incredible day at Grand Teton National Park.