Starting with "B":
* Busch Gardens (multiple locations, including Tampa, Williamsburg, and Africa)
* Blackpool Pleasure Beach (England)
* Bobbejaanland (Belgium)
* BonBon-Land (Denmark)
* Battersea Park Children's Zoo & Funfair (England)
* Beyond Limits Entertainment (Singapore)
* Big Bear Lake Alpine Slide (California)
* Ballycastle Amusement Park (Northern Ireland)
* Beach Blast (multiple locations, US)
Using "B" prominently:
* Six Flags Great Adventure & Safari (New Jersey)
* Adventureland of Anaheim (California) - "Adventure" has a "B" sound
Let me know if you'd like a list for another letter!