The timetables for the local buses around Cascais, Estoril and Sintra can be seen at
http://www.scotturb.com but unfortunately the website currently lacks a route map! Hope that helps and enjoy your visit.
Here's my potted list of the routes compiled from a visit:
At the time of writing the website does not have a list of routes or a route map. Timetables can be accessed through the 'Horarios' link on the front page.
Routes with rush hour only or very infrequent service are not included. While the most important routes operate until midnight, many close down at around 8pm. Buses are generally about one an hour, more frequent on some routes but less frequent at weekends. Buses called 'local' link the town centre/railway station with suburbs.
400 GIRO Cascais town - Cascais Shopping every 45 minutes every day 0930 - 2345
402 Cascais local
403 Cascais - Sintra via Cabo da Roca and Colares
404 and 405 Cascais local
406 Cascais - Cascais Shopping - Adroana - Estoril
407 Cascais - Amoreira - Estoril
408 and 409 Cascais local
411 Cascais - Estoril
412 Cascais - Estoril
413 Cascais - Estoril
414, 415 and 416 Cascais local
417 Cascais - Sintra
418 Estoril - Sintra
419 Estoril - Alapraia
423 Estoril - Aboboda
424 Portela de Sintra Station local
427 Cascais local
433 S. Pedro Chão de Meninos - Portela de Sintra Station
434 Sintra Station - Castle - Palace - Station every 15 minutes in summer daily 0905 to 1950
437 Sintra - Algueirâs
439 Portela de Sintra Station - Almoçegeme some buses continue to Praia Grande
440 Portela de Sintra Station - Janas - Azenhas do Mar
441 Portela de Sintra Station - Praia Grande - Praia das Maças - Azenhas do Mar - Terrugem
442 Portela de Sintra Station - Fontainelas
443 Portela de Sintra Station - Terrugem - Catribana
445 Portela de Sintra Station - Carvalhal
446 Mira de Sintra Station - S. Pedro Chão de Meninos
447 Portela de Sintra Station - Almargem do Bispo
455 Cascais - Rio de Mouro
456 Estoril - Alcabideche extended daytimes to Rio de Mouro
458 Algueiras - Mercês
460 Rio de Mouro - Mem Martins
461 Carcavelos Station - Tolaide
462 Cascais - Carcavelos
463 Cacém - Carcavelos
464 Carcavelos - Manique
467 Oeiras Station - Sintra Station
470 Oeiras Station - Conceição de Abododa some extended to Talaide
471 Oeiras local
472 Carcavelos local
475 Carcavelos - Zambujal - Parede
477 S. Pedro Estoril local
479 Oeiras Station - Zambujal - Parede
489 Oeiras - Parede