From my researches I found an idea of laying a water pipe and instal a set up for sprinkling water automatically.

Sure, you need to share some numbers with investors, but they should be liberally sprinkled with disclaimers such as, "No guarantee of future results.

Notably, the ordinance, 445.20 requires the sprinkling of sand where snow or ice cannot be removed. 

Some all direct mail, some all PPC, some all cold calling and some a little of everything with a little driving for dollars sprinkled in.Each method works a little differently in different markets and a lot of it is the price point of the houses. 

I'm not looking to be a full time agent, but simply use the license to my advantage in my own investments, with a few family/friends deals sprinkled in every now and then.Does anyone on BP have recommendations on San Diego brokers I could potentially hang my license?

You can still sprinkle a little grain of salt on what they are saying, but the commentary about the law provided there is quite valuable as a new landlord. 

I think that short sale deals are built for long term planners, and many of my investors sprinkle them in around other projects.  

Or you can buy and hold a property and get a small sprinkle of cash coming in every month.

I did notice that there were some higher interest rates sprinkled in, but then upon researching the properties, those places wouldn't really meet my criteria.What would be a good bid to place?

The last gentrifying area I bought into had just selected a winning developer, the contract award came with City approved plans for the developer to build out a combination of 2,600 new SFR's Condo's, For-Rent Apartments, and a Senior project, with some affordable units sprinkled into the mix to appease the local politicians for gentrifying the area and forcing the poor out, there was also a Whole Foods, Target, and others retailers committed.