The Government's plan to buy Ronald Reagan's mountaintop retreat for $5 million and turn it into a state park may have fallen apart this week, in the face of a duststorm of local opposition.

It took some getting used to, he confessed, moving from the viper's den of gossip to an isolated mountaintop retreat.

The indictment alleged that Mancuso used a multi-state cocaine and marijuana smuggling operation to buy ranches, mountaintop retreats, beach-front estates and anything else he might want.

Each pass was designed to bring them as close as possible to the Aga Khan's mountaintop retreat, which their pilot was pleased to point out and discuss.

When not on duty, Wiley relaxes with Thor in the secret solitude of his isolated mountaintop retreat which he leaves when summoned into action via a hidden underwater tunnel.

It would be great to see Beale stroking a white cat in some sinister mountaintop retreat.

Dozens of prominent Democratic Party leaders-members of Congress, governors, labor leaders, academics and clergy-were summoned to the mountaintop retreat to confer with the beleaguered president.

They are looking at Berchtesgaden, Hitler's mountaintop retreat.

A local guide told us that the ultimate sakau experience could be had at the mountaintop retreat of the Douk Sokehs, one of the island's five reigning elders.

LEAD: President Reagan and his wife, Nancy, took advantage today of their first vacation in more than four months at their mountaintop retreat, Rancho del Cielo, near here.