Spelunking with a sippy cup. Today, on the recommendation of our good neighbor Eric, we went off to visit Ohio Caverns. At one point, the same point Frankie decided she didn't want to be restrained any more and wanted to run free despite being part of a tour group of 20 people and walking on a slick, dark, winding path about 18 inches wide, we were over 100 feet below the surface observing stalactite and stalagmite formations. It was pretty cool. Only an hour from Columbus too.
I think the kid may need a few more months before tackling any more challenging terrain.