bacardi gold is a good mid-grade clear rum so it should go well with any classic rum mixers i.e. coke, sprite, fruit juices or cream soda. Good mixed with bacardi superior is a tomato juice with a little bit of salt.Try to mixed a pineapple with a bit of lemonade. Lemon drops...bacardi limon a little simple syrup (optional) a sugar rimmed glass.
Yes, the shelf life of rum is indefinite. So, your bottle of Captain Morgan, Plantation or Bacardi, should be safe in the cabinet, as long as the seal is not broken and the bottle is not opened. As long as you keep it sealed and unopened, you could open it in 2050 and it should be fine to drink.