Great question...
- Airline tickets
- Hotel rooms
- Home repair items (so big retailers)
- Pubs...yes pubs! I want to see if my pub tab would be greater at the start of the night or the end of the night
- Groceries
- Hip restaurants
I'll think of more.
I want to see every service with bitcoins that are using fiat at the moment. Transportation of all kind (from taxi to aero plane), shopping (especially that of electrical appliances whether its online or not), eating in restaurants or hotels, recharging my phone, buying either food products or the raw form, paying bills, fees of educational institutes, everywhere. I want bitcoins to be accepted for every single service I enjoy now and then.