I don't like cameras around my neck, either. When I need to be mobile I use a waist belt system from Think Tank and Upstrap camera straps on my cameras. The Upstraps easily keep the camera solidly on my shoulder without any slipping (so, not around my neck), and the waist belt system can be set up to carry all sorts of gear -- extra lenses, a flash, cards, batteries, etc.
Not sure I would love this for very long hikes for landscape or wildlife photography, but it's great for sports or journalism.