There are a number of sources you may be able to utilize to find rentals in Rancho Santa Fe. I agree with Mark and Kari, Craigslist is a good first good step. I would also suggest looking on Trulia, HotPads, Zillow and local sources such as the Rancho Santa Fe Review. Rancho Santa Fe has a community center in the heart of town, you could check to see if they have any leads on rentals or where you might be able to advertise. Another idea might be asking local Rancho Santa Fe Real Estate professionals if they know of anything that will be coming on the rental market. Agents usually have the inside information on properties that homeowners may wish to rent for long term leases or vacation rentals.
I hope this helps and best of luck to you!
Jamie Danielle, Realtor
Real Equity Advisors, Inc.
Rancho Santa Fe, Ca. 92067