We use the trails you mentioned as a connector from the Crystal Bridges area over to Leopard Loop and Tristan's trail. They are pretty awesome with the creek running through them.
I believe the light display will already be going when you are up there Teamsloan. Definitely worth getting tickets and taking the family.
Cafeend, other than hiking, there is the world class Crystal Bridges Museum with a Frank Lloyd Wright house tour. The Momentary may be of interest, and I think there is a children's museum around there, too.
Teamssloan is quite correct about riding in the rain there--a lot the Little Sugar trail on the west side of Bella Vista is quite rideable in the rain (we got rained on while riding there last Thanksgiving.) I can't wait to get back on the bike and make it back up there.