Edit: I would make them water placeable. Volcanoes and lava often go down to sea level and into the sea. Plus there are many islands around that are dormant volcanoes.
I have not seen a copy of either ZT1 or ZT2 in many years. Do you have a disc drive to install a hard copy? If so, you might try half.com, which was bought by Ebay. You might find a used copy there.
You can also try this link on our old friend Anne-Lis Brenden's Google Drive. Hopefully it still works.
ZT1 and ZT2
Beta Giftshop
Beta Foliage
Beta Scenery Buildings
Beta Rock Formations
Beta Observation Areas
Beta Giftshop
I have not rereleased the elephant and lion yet
Serpy be careful with the betas. Often there is a reason they did not release them and in some cases adjustments need to be made in how they work.