United Healthcare (AARP) doesn't offer Plan G in the 32162 Zip code. Other companies may.
UH is nationwide for any doctor accepting Medicare and Plan F covers 80% of foreign travel as do other plans.
There is no cap on the 20% Medicare does not cover. That can be a disaster with a serious illness.
If you choose a Medicare Advantage plan carefully examine the choices available, especially hospitals. Large cities have lots of good choices, but around here they can be limited. As long as your healthy anything works, but serious illness can strike fast.