Here is a map of Alajuela, provided by Norman and Isabel at Vida Tropical. I’ve added the bus stop to Grecia (G). The buses from San José and Heredia can drop you next to the parking lot across from Soda Palmares (1). The express bus to UCR is on the South side of the central park.
There is a good seafood restaurant North and West of the Tribunales (on the road to Poás) – called something like Aquí Sus Mariscos.