I would suggest
Argentine with Calilegua, El Ray, Laguna Los Pozuelas, Chaco, Ibera and PP Uruguay + south
There is possible tropic birds and in south also Penguins. High chance of Grand Tucan, King Vulture, Condor, Rheas, Flamingos, Great Hummingbird and so on.
For South America quite save country.
Also interesseting sounds Yunnan in China because 770 different kind of birds and high number of endemics ( almost 40 ).
Also vote Thailand. Many birds and easy for travelling on own steam.
For seabirds Seychelles. Birds can seen from been. Dependend on time and area 1.000 or even tenthousends per hour.
On Cousine Islands at day trip birds close less than 5 meters.
On La Digue every morning pass thousends of seabirds ofter closer than 50 meters.
Interesting sounds Sulawesi, but seems difficult by own steam ?
Same I suppose for Iriyan Java ?
