Nie poprawię całości - niektórych fragmentów nie rozumiem.
Jestem samoukiem, więc wszystkie podpowiedzi i informacje będą mile widziane

Aha, i w nawiasach napisałam to, co chciałam wyrazić, w razie, gdyby angielska wersja była niezrozumiała.
"1600 km in 14h. (in view of stopovers and our
Polish roads) it's
a really good result

Yeah, I am alive.
What is more, I enjoyed rollercoasters
so much, that I tryied
it (this - tego lub them - ich) many times (spodobały mi sie tak bardzo, że jeździłam na nich wiele razy), I had even the courage
to go on the first places ?:)
A brave girl
!Oh God, that was amazing. Admittedly
, my elbows are beaten-up, I have many scratch
es and bruises, but
what to do (lub: who cares, lub: that's even not worth mentioning, itp):)
We
developed a theory (wysunęlismy teorię), that I am just very small, and I had too
much (niepoliczalny) free
space in a (
raczej the) cabin. That's true, I just flew in cabins... Well, there is no doubt with one thing. I had great fun there and felt again like a child

I have seen the most beautiful views in Italian Alps (It was the first time, when I have seen highway punched through the mountains

And unforgetable views are when you drive out from a tun
nel (with
the speed
of 190 km per hour) and see on both sides of
the highway several hundred meters
deep abyss. Amazing.
I
've broken down all sorts of fears and have tried all
(everything?).
Blue tornado rocks, and was the greatest attraction there (???). I was in
an aquapark as well, and there I have made the most dangerous thing in all
my life. I am afraid of water in water basin. Ofc if it has n
o more than 120 cm, everything is alright, but when it is
deeper, or when there are waves... I went down
a slide more
or less 6 floors high
into the swimming-pool. First 3-4 floors was almost plumb... I realised what I have done
a few seconds after I was in
the basin

Kinda late

Anyway, that was
a really great experi
ence, and if you have ever possibility to use something like that, don't
think twice (nie zastanawiaj się), just do it

dziękuję z góry i pozdrawiam.
Ogólna uwaga: nie przejmuj się poprawkami typu "a/the" - ja wpisuję to "na czuja" (po przeczytaniu paru książek po angielsku). W sumie większość to drobiazgi.