This is the 9943rd most frequent Spanish word.
buenísimos
Extremely good.
Here, 'buenísimos' is used to emphasize the deliciousness and high quality of the chocolates.
Los chocolates que compré son buenísimos.
The chocolates I bought are excellent.
In this sentence, 'buenísima' is used to convey extremely positive experiences during the vacation.
Pasamos unas vacaciones buenísimas en la playa.
We spent an excellent vacation at the beach.
Here, 'buenísimo' describes the outstanding quality of the concert performance.