This is Route A
https://maps.google.com/maps?saddr=Transport+Museum,+Glasgow,+United+Kingdom&daddr=A739,+Bearsden,+United+Kingdom+to:56.0370728,-4.3972789+to:A81+to:56.1742631,-4.3594451+to:Lake+Of+Menteith,+United+Kingdom+to:M9+to:Unknown+road&hl=en&sll=56.02525,-4.042969&sspn=0.432833,1.352692&geocode=FQ5wVAMdhkm-_yEDUBaz2fZ8CynvMULy0EWISDEDUBaz2fZ8Cw%3BFe8EVQMdgwi-_ylL4t5K8kWISDFo-IS8bfi9mw%3BFdAOVwMdIue8_ylRjKA5NVeISDEq9ZJZ0Xtq5Q%3BFV8fWQMdMGO9_w%3BFbcmWQMd63q9_yn75r60C_eISDHXwkHFXdtq8w%3BFfoqWQMddY2-_ylnO1TGifaISDFYp_ABGBsqTw%3BFS5UWAMdum3D_w%3BFZzUVAMdzSXA_w&mra=dme&mrsp=6&sz=10&via=2,4&t=m&z=10
This route ends at ASDA Bishopbriggs (just a suggestion)
This is Route B
https://maps.google.com/maps?saddr=Transport+Museum,+Glasgow,+United+Kingdom&daddr=Stockiemuir+Rd%2FA809+to:56.0370728,-4.3972789+to:A81+to:56.1742631,-4.3594451+to:Lake+Of+Menteith,+United+Kingdom+to:Kirk+Ln%2FB8075+to:A811+to:Woodburn+Way%2FB8030&hl=en&ll=56.001453,-4.165192&spn=0.4331,1.352692&sll=55.934395,-4.273338&sspn=0.108463,0.338173&geocode=FQ5wVAMdhkm-_yEDUBaz2fZ8CynvMULy0EWISDEDUBaz2fZ8Cw%3BFQd7VQMdxrm9_w%3BFdAOVwMdIue8_ylRjKA5NVeISDEq9ZJZ0Xtq5Q%3BFV8fWQMdMGO9_w%3BFbcmWQMd63q9_yn75r60C_eISDHXwkHFXdtq8w%3BFfoqWQMddY2-_ylnO1TGifaISDFYp_ABGBsqTw%3BFSHiWAMdLwzC_w%3BFTrlVwMdu5K9_w%3BFWaaVQMdtSm-_w&mra=dme&mrsp=1&sz=12&via=2,4&t=m&z=10
This route ends at Milngavie Train Station (also a suggestion)