Anything with a lock. Just figure out that I'm me and open. If I leave lock up. Open up for anyone on my authorised list.
More cameras pointed at stuff. Our local club (100 members) purchased a weather station and decent camera and pointed it at the sea so we can all check the wind and surf. Cool. More of these cheaper please.
We have Woo devices that we attach to kiteboards, these measure jump height, duration and G force. These are then synced to a phone and internet, so not quite IoT but close. More of these please. Attach them to anything that moves (shoes, kites, surfboards, swim fins, soccer balls, bike) more data is fun.
GoPros, most people I know have these. They need to be better hooked up to the internet.
I think there are a ton of IoT that will make sense and people will buy. Just because you don't see the value in a toaster hooked up to the 'net, doesn't mean the IoT is dumb. I think it's great.