First, The List

Let’s start with a list. How appropriate. A hobby on lists. Anyway, a list of the more common and popular hobbies and pastimes that regular people can and do engage in.

The list below is collated from WiKiPedia:

Animal-related
• Fancy (animal breeding) - Keeping pet or show animals
• Animal rescue (injured or orphaned wild or domestic animals)
• Beekeeping
• Dog breeding
• Herpetoculture
• Horses

Aquariums
• self-Maintaining Home Aquarium

Arts and Crafts
• Blacksmithing
• Crochet
• Dollhouses
• Doll making
• Drawing
• Embroidery
• Enamels
• Knifemaking
• Knitting
• Miniature figures
• Origami
• Painting
o Figure painting (hobby)
o Tole painting
o Watercolor
• Pottery
• Quilting
• Scrapbooking
• Sculpture
• Sewing
• Stained glass
• Stamping
• Warm glass
• Weaving
• Wood carving
• Woodworking

Collecting
• Antiques
• Artwork
• Ashtrays
• Autographs
• Beer Cans
• Books
• Bottles
• Calendars
• Candlesticks
• conifer cones
• Bottle caps
• Christmas accessories
• Cigarette cards
• Classic videogames
• Clocks
• Coasters
• Coins
• Collecting fossils
• Comic books
• Currency
• Dice
• Dumpster diving
• Enamels
• Found objects
• Hats
• Keychains
• Lighters
• Lunchboxes
• Microchips
• Miniature models
• Patches
• Phillumenism, i.e. collecting matchbooks and matchboxes
• Photographs
• Poker Chips
• Postcards
• Posters
• Quotes
• Records
• Collecting Rocks and Minerals
• Scale models
• Scissors
• Shopping lists
• Shot glasses
• Souvenirs
• Spoons
• Stamps
• Swords
• Teddy bears
• Thimbles
• Trading cards such as baseball cards
• Wine labels
• Yardsticks

Computer-related
• 3D computer graphics design
• Animation design
• Computer games
• Computer programming
o Open source and the free software movement
• Operating systems, e.g. GNU/Linux
• Photoshopping
• Retrocomputing

Cooking
Any food/drink you feel like making

DIY (Do It Yourself)
• Home Repairs

Electronics
• Amateur radio and CB radio
• DIY audio
• Designing and building electronic circuits
• Hardware hacking
• Robots
• TV and FM DXing

Film-making
• Animation

Games
• Board games
o Backgammon
o Checkers
o Chess
o Chinese Checkers
o Go
o Monopoly
o Pente
o Rummikub
o Tournament Scrabble
o Stratego
• Card games
o Bridge
o Poker
o Backgammon
o Gin rummy
• Dominoes
• Role-playing games
• Wargaming, sometimes with miniatures

Internet-based hobbies
• 43things.com
• Blogging
• BookCrossing
• Currency bill tracking
• Geocaching a modern day form of treasure hunting
• Google Whacking
• GPS drawing
• Newsgroups
• Wikipedia

Literature
• Constructed languages (conlanging)
• Learning foreign languages
• Reading
• Writing

Model (scale model) building
• Live steam models
• Matchstick models
• Military models
• Model aircraft—civil and military
• Model cars, including radio-controlled cars
• Model commercial vehicles
• Model engineering
• Model houses
• Model figures—historical and military
• Model military vehicles—including armored vehicles
• Model nations
• Model railways/railroads
o Backyard railroads
• Model rockets
• Model ships—civil and military

Motor vehicles
• Antique cars
• Car washing
• Kit cars
• Motorcycles
• Off-roading
• Trucks

Music
• Musical composition and MIDI composition
• Singing and playing musical instruments

Observation
• Amateur astronomy
• Geyser gazing
• Metrophilia
• Transport spotting
o Aircraft spotting
o Bus spotting
o Train spotting

Outdoor nature activities
• Backpacking
• Birdfeeding, birding, and birdwatching
• Butterfly watching
• Camping
• Caving
• Canoeing and kayaking
• Gardening, including forest gardening, organic gardening, wildlife
• Geocaching
• Kite flying
• Mountain climbing
• Rafting
• Rock climbing
• Rockhounding (rock and mineral hunting/collecting)
• Skiing
• Stone skipping
• SCUBA diving
• Walking

Performing arts
• Amateur theater
• Dancing
• Magic tricks
• Singing

Photography
• Darkroom work, i.e developing films and enlarging photos in black-and-white or color
• Kite aerial photography

Puzzles
• Crossword puzzles
• Jigsaw puzzle
• Word seek puzzles

Research-related
• Genealogy
• Hagiography

Restoration (refurbishing)
• antique machinery
• Early computers
• Houses
• Sailboats, early motorized boats

Sports or other physical activities
• Archery
• Baseball, softball, and rounders
• Basketball
• Bowling
• Cycling
• Dance
• Fantasy sports
• Freshwater and saltwater fishing, including fly fishing
• Football
• Football (soccer)
• Gliding
• Golf
• Hunting
• Martial Arts
• Racquetball
• Sailing
• Shooting rifles, pistols, and shotguns
• Table tennis where the level of play isn’t really hindered by advanced age
• Tennis
• Ultimate
• Volleyball

Toys of some sophistication
• LEGO, including Brikwars, and Lego Mindstorms
• Radio control toys

And scanning through this huge list, I can pick out some that I already am engaged in. To name them: Coin Collecting or Numismatics, Tennis, Charcoal Pencil Drawing, Collecting Old Music (50's and 60's), etc. I also build my own PCs. As a matter of fact, I am using a self-built PC right now, and surrounded by two more that I also built.

Hey, this is going to be fun. For me, at least.