Just got back today. The flowers were awesome. Our highlights were an overnight backpack up into the Chisos and an overnight raft trip. We had 2 families, each with a 6 and 9 year old. We hiked in ~4 miles and dropped off gear at the campsite in Laguna Meadow (#2-huge site, plenty of room for a big group, and right below Emory Peak), then did the 5 mile round trip to the South Rim in one day and hiked out the next day. We were so proud of the kids. My wife and I hiked it ~13 years ago, but the entire range had a cloud sitting on it so we never saw a thing. The view off the rim this time was so worth the effort with the kids (carrying all that water was a bitch).
The raft trip was with Far Flung and went through Colorado and Dark Canyons in the State park. The outfitter did a great job and we all had so much fun. We also went across the border to Boquillas, went to the hot spring, hiked the window, went to the Starlight, stayed in the Tipis at Basecamp Terlingua, which were really nice, and stayed in Marathon a night.
What a great place to visit.