My bike tours are vacation tours. My favorites have been supported as well as unsupported tours domestically and overseas. I really enjoy traveling by bike, but no longer have any desire to have an adventure. I suppose it's an age thing.
Even standard air + auto tours can be a hassle & on bike adventures the hassles can be 3X that. Shorter tours can limit the route to the more scenic & suitable areas. I would have thought that GAP tour was something of an adventure though. I'd like to do a cross-US tour just to experience riding into super-fitness. Even weekend tours do an amazing job at improving fitness where you start to laugh at the hills.