Kyviskes is small village not far from Vilnius, which is known
because of small aerodrome located there.
Its being called 'Vilnius "Darius ir Girenas" aero club'.
This aerodrome is popular skydivers dropzone. Vilnius Scydiving Club is located here.
You can try to do your first jump and maybe.. later to join club :)
Some people could try short acrobatic flights.
Acrobatic flying pilots also uses this aerodrome to practice for competitions.
Students of VGTU Gustaicio aviation institute are having flying lessons here.
This aerodrome still has big potential to grow as it is close
to Vilnius.
It also belongs to military forces, but militaristic part is not very
active, only sometimes they are doing some trainings.
To find cache you need to answer to simple questions:
Which planes are pictured in photos below?
First picture

Second picture

You have to find answers in Internet or ask experts which
airplanes are pictured.
First is very popular soviet two seated acrobatic airplane, second
(in a background) is also famous soviet plane, used for different
purposes: military, entertainment, sports, agricultural (In
Soviet Union countriesits being named as 'Kukuruznik' (corn plane),
because it was watering corn fields in back days)
First one is: YAK-xx ( 'xx' here stands for 2 numbers, which we
will call AB)
Second one is: AN-x ('x' here stands for 1 number, which we will
call C)
Cache location:
N 54 40.2(A+4)(B-1)
E 025 30.2(C+5)4
Cache is small plastic sandwich box rolled-up in black bag.
Please watch out for muggles, sometimes its very busy there.
Warning: despite that road signs says that is forbidden to go
inside because its military territory, Im sure that you easily go
inside, and park your car next to building (20m from cords are
given). After finding cache you can go in front of main building to
watch for plains, there is shelter (you can see it in first picture)
where you can enjoy view of aerodrome.
Just maybe please do not go to airplanes and Im sure no one will bother you.
Probably you dont want to go there at night.
If in any case somebody will ask you what you are doing there,
you could say, that you are interested in skydiving
or your hobby is aviation :)
You can check your answers for this puzzle on GeoChecker.com.