Hmmm ... fun question for reminiscing! I have been to ... USA, Canada, Mexico, Jamaica, Bahamas, Panama, Costa Rica, Belize, Nicaragua, Honduras, Haiti, Dominican Republic .... Chile, Brazil ... Japan, China ... France, UK, Belgium, Netherlands, Germany (East & West in the day), Switzerland, Monaco, Luxembourg, Norway, Denmark, Austria, Spain, Italy ... South Africa
Quite a number of those places I've spent at least some time traveling by myself. Other times with some combination of family or friends. I've never done any sort of group tours. Largest "group" I've ever traveled internationally with would be a family group of 8.