I dreamt that there was a very distinctive town in Wisconsin somewhere north of Madison in a hilly area (probably along this road). From the road on top of nearby hills you could recognise it by the shape of a building with two steeples. I was visiting with someone (either YC or Karen), and while they were off doing something else during the day I borrowed their bike and rode around. There was a raised highway a bit to the east of downtown that I biked under and maybe biked south along it.
I had invented a self-propelled air mattress. Hammersley was apparently a river, because I was racing down it on the mattress, which was floating on water. I passed Josh's house. He had a pool in the front yard and was diving into it.
Mom and Dad were travelling around the country on trains. I was looking at the routes they were taking on a map of the US. It reminded me of playing Ticket to Ride.