Debate about advantages and disadvantages of a three-day trip

Firstly, a three-day trip involves some annoying work dealing with getting everything ready everything such as a review of the car, looking for the suitcases and rucksacks (British, i guess, no entiendo) and booking in a hotel. Depending on the time of the year  you will find that  prices are higher or lower (don't say "upper") or lower prices. In summer it is  impossible to find a cheap trip as prices rise a lot.

find a cheap trip---mas bien, find a cheap hotel/lodging or ti have a cheap trip

 Nevertheless if the plan is for march or october good offers are expected.

decimos siempre, what's more, no what is more, aunque obviomente los dos son correctos gramaticalemente

What's more, it is very important to get the car working fine as nobody wants to suffer an umpleasant surprise. In addition, it is a good idea to take a map with you in order not to get lost; above all it is recommended to absent-minded people. In this kind of excursion nobody can go without a good pair of trainers (??) and some sunglasses on the mountains too. ??sunglasses and mountains?? no entiendo lo que uno hace al otro
Personally, I think a three-day trip is good to forget routine, stress and have a good time living a new experience.
That means to have the chance to ride on a horse, surf on the sea or whatever anybody likes. Obviously, it is a great opportunity to do some sports such as riding on bike, swimming or climbing.
And ,finally,if somebody goes on a group trip, that means meeting new people from different places, which is wonderful.