Traveling through Miami this week and thought i'd see if anyone had any recommendations. Feel free to pm me with any advice.  Ideally some sweet, natural,  20-something who is mature and can hold a conversation too.

She meets all your criteria.  I met her and was amazed about how mature and well spoken she was for her age.  I didn't spend any private time with her, but her reviews speak for themselves.

Goog luck

try the search function, it does wonders.