The Breeze is a big blue bus is part of the North County Transit District, that services the North County of San Diego. Though this is basically for the North County, it does connect with the MTS in the southern part of the county. I've never used this system.
However, I do see the buses pass by so know that they go to useful places and they do have stops at the train station. There are about 28 routes, so you should be able to get around nicely. As far as I know, The Breeze goes north to south from Oceanside to La Jolla and east to west from Vista to the coast.
Check with the website for current routes and fares.
The Coaster is not as obscure as it seems from the photos. The Coaster is a commuter train servicing the Northern part of San Diego County. It has a stop in Encinitas and the route runs north from Oceanside to south as far as the Santa Fe Depot in downtown San Diego.
Look closely at the photos background. The Coaster runs right through the middle of Encinitas. Mainly the beach-y/touristy stuff is west of the tracks and the residential area is found east of the tracks.
The station is located in the middle of Encinitas at:
25 East "D" St. at Coast Highway 101 and is well within walking distance to the beach, restaurants, bars and shops.
Also the Coaster is a great way to take a daytrip to San Diego. The price is very reasonable.
Encinitas is a city in California so I should tell you that having the use of a car is most efficient and most convenient. I did not notice any abnormal problems with parking and I did stop at a few places, and have over the years not had a problem with traffic. Even on weekend days when beach towns tend to swell with visitors.
If you are of the new generation of car haters, you can get along without a car, but be prepared for time consuming waits and long walks.
Encinitas is small enough, that once in one of the coastal areas of Leucadia, old Encinitas and Cardiff, you can get around by walking. Now, if you'd like to visit the village of Carlsbad to the north, simply take the Coaster from the station just one block east of Highway 101 on Vulcan near Encinitas Blvd. Or take it south to Old Town. A little further south and you're in downtown San diego. Form either Old Town or downtown you can connect with the trolley and visit the gaslamp district or even the stadium.