There are also Maplets apps specifically for bike routes, metro, California state parks, and Canada.
Give Maplets a try for yourself by downloading the app, linked below.
Maplets| Apple Store
Maplets| Google Play Store
Maplets Lets You Use Maps Offline
iOS/Android: The Maplets app allows you offline access to public transportation, city, park, and other maps on your mobile device. The app costs $2
