I feel uniquely qualified to answer.

I chaired the first and second PRA convention at Mentone (96-97)

Mentone is a small but nice country airport with one runway, north/south, newly
repaved, no taxiways about 2500 feet long. with AVGAS sales.

Mentone airport houses the PRA world headquarters (a nicely maintained double
wide modular home with a large deck)

The Archimedes V/STOL museum (A decent collection of vertical/ short takeoff
flying machines and memoribilia) and a reasonably large shower/bathroom
facility.

A "control" tower (announcers stand)

Concession stand with covered dining area

and a row of open door T-hangars.

PRA owns acres of open land around the runway and has developed some near the
T-hangars as motorhome type campsites with water & electric.

The surrounding land is flat farmland with the occasional stand of trees. Ideal
to fly over.

The town of Mentone is a few miles away and is a typical small town. No lodging
facilities, but good restaurants.

10-15 miles East, West and Southwest are larger towns with ample motels,
stores, shopping and entertainment. They are 10-15 minutes away .

Mentone is not too far off of a major interstate (I-80) but is not convenient
to reach by scheduled airlines.

Airlines service South Bend, Fort Wayne, Chicago and Indianapolis in order of
increasing distance.
From Chicago's O'hare or Midway airports you are looking at a 2 1/2 to 3 hour
drive.

I don't think it would be practical to fly-in to a large airport, drive to
Mentone and back in a day. There will be at least a full days worth of things
you will want to do at Mentone anyway.

If you are into sport rotorcraft this is the place you'll want to be.
Bensen days is a very close second but is just as bad or worse from a lodging
and transportation standpoint.
I hope I've helped, Tom