[Nero_3D]

That would be one way using arrays

pawn Код:

CreateRandomMissionCheckpoint(playerid, Float: size) {
    static const
        Float: sData[][] = {
            {0.0, 1.0, 2.0},
            {3.0, 4.0, 5.0}
    };
    new
        rand = random(sizeof sData)
    ;
    if(SetPlayerCheckpoint(playerid, sData[rand][0], sData[rand][1], sData[rand][2], size)) {
        return rand;
    }
    return -1;
}

The other way would be using a switch statment and putting the cordinates in SetPlayerCheckpoint directly