You should really get your advanced certification if you haven't already done so. If not I would not worry about a thing as all dives in Belize are guided (by law) and you won't get anywhere near 120ft. Though the Blue Hole is a must dive, upgrading to one of the Atolls dives is strongly recommended (great reefs). I may sound like an expert but I'll be diving BZE for the first time in October. Ive done my homework (I think...).