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Just as a thought experiment, I wonder if Our Lord, during His earthly sojourn, would have taken a ride on a roller coaster at a place like Sea World, if the opportunity had presented itself.

I can't think of a reason He would not have.

Does it mean that seminarians and priests playing football or other kind of sports or even other games for recreation is unfitting?

Are you seriously trying to equate playing football on private grounds with riding roller coasters at theme parks?

Here’s Pope St. Pius X on priestly bearing and gravity;

“In order never to be guilty of any unedifying act, the priest must regulate his actions, his movements and his habits in harmony with the sublimity of his vocation. He who on the altar almost ceases to be mortal and takes on a divine form, remains always the same, even when he comes down from the holy hill and leaves the temple of the Lord. Wherever he is, wherever he goes, he never ceases to be a priest, and the serious reasons that compel him always to be grave and appropriate accompany him with his dignity everywhere. “Hence he must have that gravity that will ensure that his words, his bearing, and his way of working arouse love, win authority and excite reverence. For, the very reasons that oblige him to be holy make it a duty for him to show it by his outward acts in order to edify all those with whom he is obliged to come into contact. A composed and dignified exterior is a powerful eloquence which wins souls in a much more efficacious manner than persuasive sermons. Nothing inspires greater confidence than an ecclesiastic who, never forgetting the dignity of his state, demonstrates in every situation that gravity which attracts and wins universal homage. “If, on the contrary, he forgets the holiness of the sacred character which he bears indelibly impressed and engraved on his soul, and if he fails to show in his outward conduct a gravity superior to that of certain men of the world, then he causes his ministry and religion itself to be despised. For when gravity is wanting in its leaders, the people lose respect and veneration for them.” (1)