I'll add a couple of corrections to those made by Linolenic (mine are in red and bold dark blue):

bil jabal - للهجة الشامية

HayAl el aiam 3m bissir fi ghuyuum aktar w aktar hun. Bzun, esh-shitaa ra7 yiussal

Here, the days are more and more cloudy. I think winter is coming.

Al El 7adi2a alwatiniye [=el-wa6aniyye/-i] (al3am(?)) el2ariibe min hun msakkara 3ashan fi al el jau 3m ibarred w isa [<em>missing portion here about the tourist. Here's my translation</em>: iza shi saa2e7/saaye7 daa3] 7aikun fi kha[t]6ar mish bas 3al[i]eh. bas kamen 3shor[t]6a illi 7ddau[a]er 3ley [=3aleh](1).

the national park nearby has been closed because is getting too cold and, if a tourist loose the way, is not only dangerous for him but also for the police to find him.

al es-sauyya7 saaru a2all w a2all, w jeiin aktar shi min america [<em>pronounced:</em> amreeka/amerka] w min l'balaad al europa [<em>pronounced:</em> orobba] [<em>or,</em> min blaad/bled orobiyyi/eh].

tourists are less and less, and they come mainly from USA and many countries of Europe.

biraiy innu, b's-saiif, by[a]igieun a2al min 500 kil yom. byaussaluna bi l-bas w bi 6-[t]6ayyara. lazim [akeed <em>would fit the context better, in my opinion</em>] 3ndun masari ktir.

I think that, in the summer, they come no less than 500 per day. they come by bus and by plane. they must have a lot of money.

3adatan, biyas7un(?) [<em>not sure what this word is, but I would say</em> bitammu] usbu[h]3een 3la ala2l. fi naas ray[h]7ein 3la l'jabal la l-mashi, w fi naas illi biy[a]u2[u]3du [<em>but for the sake of style, </em>2aa3diin<em> would be better</em>](2) bi l'mashghara la yerta7o.

they usually stay here at least two weeks. Some they go for trekking in the mountains, some they stay in town to relax.

hunne mu2addibiin, bass ktir min en-naas ma bye7ku lughatna, wa lahayk el7adiis ma3un sa3ab ktir.
lamma bataghadda ma3un , b7es inni mitl l'a[t]6rash fiz- zaffe!

they are polite but many of them they don't speak our language, that is why it is very difficult to talk with them. When I have lunchwith them, I feel lost!

(1)<em> "3aley" (or "3alay") refers to the pronounce "me." "3aleh," on the other hand, refers to the pronoun "him" [the tourist].</em>

(2)<em> Because you wrote "ray7een," it sounds better to use a word like it (of the same grammatical category, "ism faa3el" rather than "fe3l") in the next part of the sentence, "2a3deen."</em>

اللهجة اللبنانية - Lu2ja El-lahji El-Lebnanyyi

(3am bektub bil lug7a lahji el-lebnaniyyi tfaddal f7as(1, see below) isa [=iza] [lli katabto](2) sa7i7 - I try to write in Lebanese dialect please check if is correct )

Hada Haydi s-sini, bru7 3ala l nafiis l-makal [=l-maken], ia3ni 3arib [=2arib or 'arib] min hadee'ahti [=7adee'a]kebira] bi [or b'] l baladi.
al 2adee'ah el-7adee'ah bil jebel [=jabal]. ana bru7 bil saeef b' s-sayf, bas fi shalaja talej ba3ad.
hada haydi s-sini mish awwal marra 3am bru7 hunik. Es-Sini al madi [=el-madyi] kamen jeit hun,u ahab b7ebb[?] [el-maken, el-7adee'a (or el-7adee2a), etc.](3) ktir.
lesh bhebba2a [=b7ebba]? bi sara7a, ma b3arif [=ba3rif]. yemkin [3ashen] l-jebel [=l-jabal] l 3aila [=3aili/3eli], yiemkin [3ashen] l n-naas illi seknun [=sekniin] hunik, aw yiemkin [3ashen] al asdi'ahi [=el-asdiqaa', or better yet, el-as7aab] w an 3arif elli ba3refun bi l balad el 'arib min l 2adee'ah l-7adee'ah.
bas illi bizanmi [=bilzamni], ekhiir shi, lazim birtah [huwwi] er-raa7a!

This year, I go to the same place, that is close to a large park in my country.
the park is in the mountain. I go in the summer, but still there is snow.
this year is not the first time I go there. the last year too I came here, and I liked a lot.
Why I like it? Really, I don't know. Might be the high mountain, might be the people living ther, o might be the friends that I know in the town close to the park.
But what i need, eventually, is to rest!

<em>(1) "tfaddal f7as" is correct, but I assume that you're speaking to more than one person here, in which case, it would be "tafaddalu f7asu"</em>

<em>(2) "sa7i7" needs to refer to something so that the meaning is clear (iza shu sa7i7?).</em>

<em>(3) By itself, it's not clear what "b7ebb" is referring to. You should add a direct object, whether as an attached pronoun, or a separate noun (b7ebba, b7ebbo, b7ebb el-7adee'ah, etc.)</em>