With the most recent update, the Amphitheater is practically a brand new attraction along with the Lagoon Viewing Dome but as of right now it only really works well on one map (San Diego) in one era (Jurassic Park). When it’s placed on any other map with the mixed eras, it sadly sticks out like a sore thumb, so it be good not to improve its versatility in the Jurassic Park era but to also have it made available and more visually fitting for the other eras as well.
Jurassic Park era
For this era not much is needed other than to remove the San Diego subtitle, readjust the Jurassic Park signage to compensate for the former's removal and change the desert rock aesthetic to one that is more fitting when the amphitheater is placed in the game’s other environments (Alpine, Taiga, Temperate & Tropical).
Jurassic World era
For an amphitheater set in the Jurassic World era, there are two designs from the film itself and the old park website that would make ideal candidates for such an attraction:
The first candidate is the T. Rex Kingdom amphitheater.
The second candidate is what the Indominus rex Paddock would've looked like had it been completed.
I would be happy whichever of the two designs get picked, but if I had to choose which one I prefer; it would have to be the design for the Indominus rex paddock because it's more visually interesting.
D.F.W. era
“Professionally rudimentary” would be the phrase that I would use to describe a D.F.W. amphitheate. This would be a building that would be used by D.F.W. workers to observe some the larger sauropods and/or large theropods. The aesthetics of this building should blend in well with the facility seen in Dominion.
BioSyn era
There’s not much to say for this particular design, this particular amphitheater is based on BioSyn's Research Complex except the inner centre is no longer decorative and used by visitors. This is where BioSyn personnel safely observe their latest and most dangerous assets.
Malta era
If the D.F.W. era amphitheater would be described as
“professionally rudimentary” then the Malta era amphitheater would be described as just
“rudimentary”. Similar to all of the other buildings in this era, the amphitheater would be styled as an old Roman ruin that was hastily adapted for its new purpose.
Almost two thousand years ago, this amphitheater would have once held bloody combat with gladiators fighting against each other. Now in this new era, it’s used once again for a similar purpose again, with bloody combat with dinosaurs fighting each other.