...a word-of-caution, DandyDon,
...be mindful that once you dive outside the zone surrounding the old underwater theather, you will be in the area patrolled by the glass bottom boats, which are electric powered and very quiet, and while they have a pretty shallow draft, could still ruin your day if you're diving too shallow.
For peace-of-mind I'd stay at enough depth once you're out in the open river area to avoid prop hazzards.....especially be alert as you move underwater from one spring to another, as you will have to traverse significant patches of shallow, sometimes very shallow, water.
Maintain situational awareness, and make sure you can hear well, peel back you hood as needed, to listen a bit before moving across shallow areas, or surfacing.....again, the boats are very quiet...between your bubbles and a hood you could easily blunder into a boat if you can't hear it.
The 'theater' (where Bridget will run you through the underwater bouyancy control course) is safe from boats, and is a fun stress-free area to 'play' in ( lots of TX dive shops do BOW classes there) and a fair amount of room to dive in......you can touch/rest on the bottom in this area without breaking federal/state laws (or squashing any of those endangered species).
However, outside the 'theater' area it is forbidden to touch the bottom (thus Bridget's new diver bouyancy control tests) and always remember that she or other staff members will crew those glass bottom boats...so be on your best behavior, they can see your dive skills (or lack thereof) and you wouldn't want to get 'banned' from there.
The tourists in the glass bottom boats get a kick out of seeing 'scientific divers' in-action, so that's kinda cute to be putting on a show for them....so always try to look like you're doing something important down there!
Karl
P.S. since you're in the Scientific Diver class, Bridget will give you free air-fills (air-only), also, whenever you return, assuming you graduate, you'll get free air-fills in exchange for letting her put you to work on various ongoing underwater projects. Don't worry, it's a small trade-off, for a modest amount of 'work' you'll get in plenty of playtime.