I have a pretty neat world, were I built my first fortress with a (semi)megaproject.
The site has brook, magma pipe, bottomless pit, flux and sand. No underground water, though, sadly.
It has almost 50 Z-levels and an L-shaped mountain where I built my entrance across the bottomless pit.
This is the fortress (not finished):
http://mkv25.net/dfma/poi-10168Created in DF v0.28.181.40d.
[WORLD_GEN]
[TITLE:NEW]
[SEED:1596304864]
[HISTORY_SEED:527089608]
[NAME_SEED:906264864]
[DIM:257:257]
[END_YEAR:353]
[BEAST_END_YEAR:100:40]
[REVEAL_ALL_HISTORY:1]
[CULL_HISTORICAL_FIGURES:1]
[ELEVATION:1:400:800:800]
[RAINFALL:0:100:400:400]
[TEMPERATURE:25:75:400:350]
[DRAINAGE:0:100:400:400]
[VOLCANISM:30:100:700:700]
[SAVAGERY:20:100:600:600]
[ELEVATION_FREQUENCY:1:1:1:1:1:1]
[RAIN_FREQUENCY:1:1:1:1:1:1]
[DRAINAGE_FREQUENCY:1:1:1:1:1:1]
[TEMPERATURE_FREQUENCY:1:1:1:1:1:1]
[SAVAGERY_FREQUENCY:1:1:1:1:1:1]
[VOLCANISM_FREQUENCY:1:1:1:1:1:1]
[GOOD_SQ_COUNTS:100:1000:2000]
[EVIL_SQ_COUNTS:100:1000:2000]
[PEAK_NUMBER_MIN:10]
[OCEAN_EDGE_MIN:2]
[VOLCANO_MIN:40]
[REGION_COUNTS:SWAMP:1032:7:6]
[REGION_COUNTS:DESERT:1032:7:6]
[REGION_COUNTS:FOREST:4128:13:12]
[REGION_COUNTS:MOUNTAINS:8256:9:9]
[REGION_COUNTS:OCEAN:8256:7:6]
[REGION_COUNTS:GLACIER:0:0:0]
[REGION_COUNTS:TUNDRA:0:0:0]
[REGION_COUNTS:GRASSLAND:8256:13:12]
[REGION_COUNTS:HILLS:8256:13:12]
[EROSION_CYCLE_COUNT:300]
[RIVER_MINS:600:600]
[PERIODICALLY_ERODE_EXTREMES:0]
[OROGRAPHIC_PRECIPITATION:1]
[SUBREGION_MAX:2750]
[CAVE_MIN_SIZE:10]
[CAVE_MAX_SIZE:30]
[MOUNTAIN_CAVE_MIN:100]
[NON_MOUNTAIN_CAVE_MIN:200]
[ALL_CAVES_VISIBLE:1]
[SHOW_EMBARK_RIVER:2]
[SHOW_EMBARK_POOL:2]
[SHOW_EMBARK_M_POOL:2]
[SHOW_EMBARK_M_PIPE:2]
[SHOW_EMBARK_CHASM:2]
[SHOW_EMBARK_PIT:2]
[SHOW_EMBARK_OTHER:2]
[SHOW_EMBARK_TUNNEL:2]
[TOTAL_CIV_NUMBER:20]
[TOTAL_CIV_POPULATION:10000]
[PLAYABLE_CIVILIZATION_REQUIRED:1]
[ELEVATION_RANGES:8256:16512:8256]
[RAIN_RANGES:8256:16512:8256]
[DRAINAGE_RANGES:8256:16512:8256]
[SAVAGERY_RANGES:2000:16512:10000]
[VOLCANISM_RANGES:1500:16512:12000]
There's the parameters for the world. The site itself is just south of a volcano, in the extreme north regions. It's a Hot, calm area (I get elephants all the time, though). The only downsides to it is there's no underground water, and that the area is calm.