This world generates a volcano in the center east of the map, which is in a temperate zone and covered with giant trees. The volcano is quite tall and covered in many layers of soil, with the caveat that some of the layers (red sand when I played) carries an aquifer layer about half way up the volcano. Its easy to pierce, I had built half a starter fort before I realized it was even there, so you have easy water access with the possibility of indoor lakes and flowing streams, right next to a magma chamber! =D The lavatube is only about 30x30 as well, so most of the map (with a 4x4 embark) is available for building. The surface of the magma is inside the volcano (it doesn't pierce to the air far as I can tell with that lavatube bug, I even sent a guy to the top to cut trees just to be sure), so it is really easy and safe access. The entire map has flux and I saw hematite before I even started digging, so steel is not a problem.
World map is medium, with very short history, medium civilisations, very low sites, very low savagry and minerals everywhere. Neighbors are dwarf, human, and elf. Unfortunately no goblins civs, is that easily changed in the world generation parameters, or what? Wouldn't mind a little more action.
I played by putting the volcano on the lower left corner of my embark, then the game generates you on the north slope and you can dig straight in to the stone core from there without hitting the aquifier.
[WORLD_GEN]
[TITLE:CREATE WORLD NOW = 4131115]
[SEED:wIG6ycO6AcYWGOowaUiI]
[HISTORY_SEED:k88iAOMQ6mqSmm8M6Ios]
[NAME_SEED:Em8628CsEmKi2Ai4aOSM]
[CREATURE_SEED:yqUS64EY6YOkgO08oCcm]
[DIM:129:129]
[EMBARK_POINTS:1504]
[END_YEAR:5]
[BEAST_END_YEAR:5:-1]
[REVEAL_ALL_HISTORY:1]
[CULL_HISTORICAL_FIGURES:0]
[ELEVATION:1:400:1600:1600]
[RAINFALL:0:100:200:200]
[TEMPERATURE:25:75:200:200]
[DRAINAGE:0:100:200:200]
[VOLCANISM:0:100:200:200]
[SAVAGERY:0:100:200:200]
[ELEVATION_FREQUENCY:4:2:0:1:0:1]
[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:3:5:4:3:2:1]
[VOLCANISM_FREQUENCY:1:1:1:1:1:1]
[POLE:NORTH_AND_OR_SOUTH]
[MINERAL_SCARCITY:100]
[MEGABEAST_CAP:9]
[SEMIMEGABEAST_CAP:18]
[TITAN_NUMBER:4]
[TITAN_ATTACK_TRIGGER:80:0:100000]
[DEMON_NUMBER:28]
[NIGHT_TROLL_NUMBER:14]
[BOGEYMAN_NUMBER:14]
[VAMPIRE_NUMBER:14]
[WEREBEAST_NUMBER:14]
[SECRET_NUMBER:28]
[REGIONAL_INTERACTION_NUMBER:28]
[DISTURBANCE_INTERACTION_NUMBER:28]
[EVIL_CLOUD_NUMBER:14]
[EVIL_RAIN_NUMBER:14]
[GENERATE_DIVINE_MATERIALS:1]
[GOOD_SQ_COUNTS:6:63:0]
[EVIL_SQ_COUNTS:6:63:0]
[PEAK_NUMBER_MIN:3]
[PARTIAL_OCEAN_EDGE_MIN:0]
[COMPLETE_OCEAN_EDGE_MIN:4]
[VOLCANO_MIN:1]
[REGION_COUNTS:SWAMP:66:0:0]
[REGION_COUNTS:DESERT:66:0:0]
[REGION_COUNTS:FOREST:264:0:0]
[REGION_COUNTS:MOUNTAINS:528:0:0]
[REGION_COUNTS:OCEAN:528:0:0]
[REGION_COUNTS:GLACIER:16:0:0]
[REGION_COUNTS:TUNDRA:33:0:0]
[REGION_COUNTS:GRASSLAND:528:0:0]
[REGION_COUNTS:HILLS:528:0:0]
[EROSION_CYCLE_COUNT:250]
[RIVER_MINS:25:25]
[PERIODICALLY_ERODE_EXTREMES:1]
[OROGRAPHIC_PRECIPITATION:1]
[SUBREGION_MAX:2750]
[CAVERN_LAYER_COUNT:3]
[CAVERN_LAYER_OPENNESS_MIN:0]
[CAVERN_LAYER_OPENNESS_MAX:100]
[CAVERN_LAYER_PASSAGE_DENSITY_MIN:0]
[CAVERN_LAYER_PASSAGE_DENSITY_MAX:100]
[CAVERN_LAYER_WATER_MIN:0]
[CAVERN_LAYER_WATER_MAX:100]
[HAVE_BOTTOM_LAYER_1:1]
[HAVE_BOTTOM_LAYER_2:1]
[LEVELS_ABOVE_GROUND:15]
[LEVELS_ABOVE_LAYER_1:5]
[LEVELS_ABOVE_LAYER_2:1]
[LEVELS_ABOVE_LAYER_3:1]
[LEVELS_ABOVE_LAYER_4:1]
[LEVELS_ABOVE_LAYER_5:2]
[LEVELS_AT_BOTTOM:1]
[CAVE_MIN_SIZE:5]
[CAVE_MAX_SIZE:25]
[MOUNTAIN_CAVE_MIN:10]
[NON_MOUNTAIN_CAVE_MIN:15]
[ALL_CAVES_VISIBLE:0]
[SHOW_EMBARK_TUNNEL:2]
[TOTAL_CIV_NUMBER:40]
[TOTAL_CIV_POPULATION:15000]
[SITE_CAP:260]
[PLAYABLE_CIVILIZATION_REQUIRED:1]
[ELEVATION_RANGES:8000:1056:528]
[RAIN_RANGES:528:1056:528]
[DRAINAGE_RANGES:528:1056:528]
[SAVAGERY_RANGES:4160:2080:0]
[VOLCANISM_RANGES:528:1056:528]