We aren’t gonna give you a whole tutorial on this one, just some general recomendations:

In Prague:

• Public transport accuracy is usually very good, but the most is IDOS and other natively Czech apps.
• For walking and driving routes it works pretty well.
• Google maps is great for visualising routes, and where things are.
• Most restaurants and places are up-to date here.

In Hradec:

• No public transport routes are available as of writing this, stick to IDOS.
• For walking and driving routes it works pretty well.
• Most restaurants and places are up-to date here.

Hikes:

• Google maps does an okay job here, but your best bet is Mapy.cz.