Family trip

Today I went to the beach with my family.  Though,I have gone to the beach for many times, I felt more happy this time, because my brother traveled with us, haha.  My brother is humours humorous and funny.  He always makes fun with us and I like him.  (The first part of this sentence is repetitive.  You can make the statement "I like him" be a sentence on it's own, or add a comma after funny and add it to the previous sentence.)
The beach is beautiful, but the seawater is salty.  Wwe played in the sea.  At the begainning, I was afraid of the sea waves, but after awhile I enjoyed them gradually,haha. Then we went to have dinner.  I tasted many delicious and special (delicious and special are adjectives, try adding what you ate.  Ex.  many delicious and special foods, ... ), so I am very full now.
Today I was very tired, but happy.  I liked the interesting trip, and I like to travel with my family very much.  Most importantly, I love my family, hahahahaha...

Your trip to the beach sounded like a lot of fun!!

There are a few things to remember:

1) Put spaces after periods and commas.  (One space after a comma, and two after a period). 

2) Plurals.  There are several exceptions to this rule, but most words have a "s" or "es" after to show when it's more than one.  ex. wave or waves. 

3) a little note between American English, and British English.  Some words are spelled slightly differently.  ex.  American:  humorous, British: humourous.  Amer.: color, Br: colour.  It depends on where you are, and which one you are learning. 

I hope this helps.

Family trip

Today I went to beach with my family. Although I have gone to the beach for many times, but I felt more happy this time, because my brother traveled with us, haha. My brother is humourous and funny. He always makes fun with us and I like him.
The beach is beautifu,l but the seawater is salty. We played in the sea. At the begaining, I was afraid of the sea waves but I enjoyed them gradually, haha. Then we went to have dinner. I tasted many delicious and special things, so I am very full now.
Today I was very tired but happy. I liked the interesting trip and I like to travel with my family very much. Most importantly, I love my family,hahahahaha...

[Good work.  Remember to put a space after all periods and commas.  Also, you can say "Although I have..., I felt..." OR "I have gone..., but I felt..."  You can have 'although' or 'but', but not both.]