Grand Theft Auto needn't all be about selling drugs, killing people and driving fast cars.
Nowadays you can also earn an honest crust delivering pizzas, driving taxis, fighting fires, operating forklifts, delivering medical supplies or even newspapers. These "Odd Jobs" are often updated with 2X GTA$ and RP rewards, and with a typically wonky Los Santos economy actually pay quite well.
Three other 'straight' businesses were added late last year (The Carwash, Smoke on the Water weed delivery and Higgins Helicopter tours) but they cost money to set up and are only fronts for illegal business, so we'll ignore those.
Pizza Delivery (Pizza This) Five deliveries will earn you up to $24,000, you have a pizza 'heat' gauge and must deliver them before they get cold on your supplied Pegassi Pizza Boy scooter, which you will be given to keep as a personal vehicle.

Taxi Driving (Downtown Cab Co.) You can get a taxi from the Downtown Cab Co. and do as many passenger deliveries as you want. Five will earn $15,000–plus a bizarre tips system dependent on how you drive. You can also buy various other cars and convert them to taxis, including the new Ubermacht Cypher Drift Taxi, which puts a whole new slant on Crazy Taxi!

Fire Fighter (LS Fire Department) There are five missions to a shift and they pay around $7,500, so a good shift will pay approximately $35,000. Fires include automobile fires, dumpster fires, house fires (which may require a rescue in a smoke-filled house), gas leaks and cat rescues! Fires are extinguished with the aimable hose atop a fire truck, and one annoying issue is the difficulty in seeing where the water jet is actually going when aiming at a roof or upper window. Why Rockstar didn't give us an extra view or free camera for this is a mystery, but these missions are still good, challenging fun.

Forklift Operator (Airport Warehouse) Loading pallets with a forklift isn't easy, particularly in GTA where Rockstar have never given us controls with enough finesse. I don't think I've driven a forklift since the Cayo Perico heist so this was like a new experience for me, especially as Rockstar added a new close-up "forks" view (press 'B' on Xbox/'O' on PlayStation) to make things easier. Load all the commodities in groups of 3 and you'll get a 10k bonus for a total of $30,000 for the shift.

Medical Supply Driver (QuickiePharm) Successfully completing 6 deliveries driving the QuickiePharm Ubermacht Sentinel GTS (a sort-of BMW M3) will net you $30,000. The problem is these can be anywhere in Blaine County, so expect some long drives with a time limit and a damage gauge, so no reckless driving!

Newspaper Round (Los Santos Meteor) Yes, it's classic Paperboy gameplay, GTA-style! Probably the most fun of all the odd jobs, you can earn around $24,000 for 10 successful deliveries, with a bonus depending on how quick you are. You get given a Dinka Thrust motorcycle to do your round on, and the deliveries always seem to be in the city. As with some other delivery missions, you don't have to get off your bike and only have to lob the papers in the general direction of the recipient's front door to make a good delivery. In a rare departure from the norm, you don't actually have to use the supplied Dinka motorcycle, and can use any of your own vehicles–including your Oppressor MkII (although you'll have to hop off it to throw a newspaper.)

Security Van Deliveries (Gruppe Sechs and Bobcat Security) Security van missions involve a single delivery of a high-value object. The most we've earned from one of these is $19,000 but this total will be reduced by poor driving/collisions. You will also get attacked by a gang of thieves on bikes and in cars at least once, but they can be ignored if you drive fast enough, and killing them doesn't alert the cops, so we thought we'd include these as well.

So there you go, you don't actually have to be a crook in Los Santos, although we all know there isn't the slightest chance that I'd own all my properties, vehicles and businesses if I'd stayed on the 'straight & narrow'...