Flamestrike
Legend
You know what would make this module memorable for a bunch of 1st level characters? A RED DRAGON END BOSS.
Like I said above, it would work well as a mini-campaign from 1st-5th.
There aint no way you're still 1st level by the time you've cleared out the forest level, upper temple, and D levels 1-3.
A well rested party with the potions of fire resistance and the ring (and also the sword) could take on a CR 10 young red dragon with an outside chance of winning.
You'd obviously run it as a non combat encounter (have the dragon refuse to let them leave unless they pay it tribute, appropriate Charisma checks/ RP can resolve, or they can just pay it) but if they want to try their arm, have at it.