My large scale, fun idea is to create a fleet of "bingo bus'". Each bus would have EMTs on board and sirens equipped in case of an accident. Each bus would have a different activity, and it would travel around picking people up and dropping them off all day. That way seniors could easily get access to activities they want without having to coordinate travel.
The more realistic version is a fleet of drivers which pick up people when they are called and deliver them to activities which they want to go to.