Use the definite article.
(The following does not include the Comunicación section.)
airport
craft
elevator
airplane
mountain bike
sunscreen
ticket
rainforest
waterfall
baggage
layover
guide (person)
suitcase
sea
nature
scenery; landscape
a walk/trip
sunburn
baggage claim
souvenir
rule
sun
train
adventure tourism
trip
view
flight
attraction
ecotourism
hotel
mountain
passport
reception
security
service
tour
tourism
visit
weather
What’s the weather like?
It’s clear.
It’s cloudy.
The weather is good.
It’s very hot.
It’s cold.
It’s windy.
It’s very sunny.
to rain
It rains. / It’s raining.
to snow
It snows. / It’s snowing.
pleasant
warm, hot (regarding weather)
next; upcoming
abroad
close, near to
far from
to board
to end, run out
to fall down
to enjoy
to go rock climbing; to climb
to wait (for)
to spend (money)
mountain biking
the suitcase
to stain
to forget
to pass/go through
to miss (a bus/flight/event); to lose
to get lost
to pick up
to check in
to break
to visit
to sunbathe