Fishing is a recreational activity, which would make it more an interest than a sports hobby.
movement, endeavor, hobby, undertaking... See more at http://thesaurus.reference.com/browse/activity.
Gardening can be either a profession, if you earn your living at it or a hobby if you do it for pleasure.
Well, a hobby is "An activity done regularly in one's leisure time for pleasure." Yes, that seems to describe Minecraft for some people very well.
Yes. Sailing could be seen as both. Yes it depends what part of sailing you do, if you take it competitively and race then it can be a sport (as it is in the olympics) or if you just cruise then it can be seen as a sport but it is more of an activity :)
Flightseeing is one word. It is the activity/hobby of viewing places of interest from an aircraft.
No you do not have to; you could just do it for a hobby.
Fish capture is a lucrative activity among fishermen because it is profitable to his or her family.It is their hobby to fish for their family for food and wealth.
No. Sewing is the act of securing something by stitching as with thread and needle. Sewing is a passive activity. Sport is some sort of physical activity that is often competitive in nature.
It could be a Fish grower, Fish farmer, his hobby work area is called the "Fisheries"
The noun 'hobbies' is the plural form of the singular noun 'hobby', a common, abstract noun; a word for an activity done regularly in one's leisure time for enjoyment; a word for a concept; a word for a thing.
golf, tennis, piano, football, playing guitar, dancing, singing