Answer:
Ooh, this is fun! So here are your answers:
Across:
Biggest= smallest
Bad=good
Shorter=taller
Worse=better
Worst=best
Near=far
Lowest=highest
Driest=wettest
Hot=cold
Shortest=longest
Down:
Hotter=colder
Smaller=bigger
Least crowded=most crowded (the most crowded?)
Coldest=warmest
Smallest=largest (biggest)
Not famous= famous
Cold=hot
Best=worst