We had limited time and decided to visit the museum in the Terra Nova visitor center when it opened at 10am. With an English brochure in hand we explored this small but interesting museum about the citadel and the city. Some of the audio displays are in English but most are in French and Dutch (of course). Even with our limited French skills we learned a lot.
If we had more time we would take some of the tours of the grounds/underground. You can wander much of the citadel grounds for free and enjoy the fantastic views but beware they lock the gates at 8 pm in summer and you could get trapped! read more