The Pizza Delivery mission is activated by getting on the Pizza Boy moped, located behind any of the three Pizza Parlors. The Pizza Parlors are located in southern Vice Point, northwestern Little Haiti and western Downtown. The Pizza Delivery mission can be activated when not on a mission at any point in the storyline.
The premise of the Pizza Delivery is self-explanatory - deliver pizzas to the citizens of Vice City. They are located on the streets, and to deliver the pizzas, you have to perform a drive-by to toss the pizzas. The customer will only collect it if it lands at least a few feet in front of them. Precision delivery is needed.
The Pizza Delivery mission works off a very similar levelling system to the Paramedic, Firefighter and Vigilante missions. On Level 1, you have to deliver a pizza to one customer; on Level 2, the number of customers goes up to two. So, each level increases the customer count by one each time, exactly like those missions. The only difference being is that there are only 10 levels, and you are only given 5 minutes per level.
You are only given six pizzas at the beginning of the level. If you run out, you will have to pick up more from the parlor. This means that route planning is critical during this mision. However, if you toss the pizzas to your customers perfectly, and you plan your route correctly, the time limit is actually pretty generous if you are good at it.
As well as route planning, knowledge of the area is critical. Use of shortcuts and knowing the quickest route will help you if you're rushed for time. If you know the streets of Downtown, then activate it from the Pizza Parlor located there. The same goes for the Little Havana/Little Haiti areas, and the Vice Beach and the northern East Island area.
You are given $10 for each successful delivery. In total, you will be making 55 deliveries. This means your profit on deliveries alone is $550.
Completion of the side-mission will reward you with an additional $5,000, and your Health will be increased to 150 hitpoints. This will be an easy side-mission once you delve into it, and there's a valuable reward to help you with other things, such as the harder missions and the Rampages.