How about 'As the wind whipped through his hair, Tom stood at the edge of the vast desert, knowing that whatever lay beyond was going to be a test of his survival skills.' This sentence not only describes the setting, which is the desert, but also implies that the character is about to face challenges related to survival, which is a common theme in adventure stories.
A great start might be 'With a map in one hand and a sense of wild excitement in her heart, Lily boarded the rickety old boat that would take her to uncharted islands.' Here, it immediately sets the scene of a character about to embark on an adventure. It gives a sense of the tools they have, like the map, and their emotional state, which is excitement. Also, the description of the boat as 'rickety' adds an element of risk and unpredictability, which are often associated with adventures.
You could start with 'In the park, under the old oak tree, two boys sat side by side, sharing secrets. Their friendship was like a warm blanket on a cold day.' This opening paints a picture of the setting (the park under the oak tree) and uses a simile to describe the friendship as something warm and comforting. It gives a sense of closeness and intimacy between the two characters.
One could be 'In a world where the moon never set and the stars were portals to other realms, a young adventurer set out on a journey that would change everything.'
One could be 'The old house at the end of the lane loomed like a malevolent specter in the moonlight.'
A great opening is 'In the middle of the night, a strange noise woke her up, a noise she had never heard before.' This creates mystery and makes the reader wonder what the noise is and what will happen next. It gives a sense of unease and anticipation right from the start.
One could be 'In a world full of chaos, his smile was the only thing that made sense to her from the very first glance.'
One could be 'The day the world ended began like any other.' It immediately grabs the reader's attention by suggesting something momentous is about to be revealed. It sets a mysterious and anticipatory tone, making the reader wonder what exactly made this day different from the others.
One good sentence could be 'As the sun dipped below the horizon, the enchanted forest came alive with a soft, ethereal glow.' Another might be 'With a wave of her wand, the young wizardess opened a portal to a world filled with glittering jewels and talking animals.' And also 'The hero's heart pounded in his chest as he faced the fearsome dragon, its scales glinting in the firelight.'
Well, 'The protagonist's footsteps echoed in the silent, ancient cave as they searched for the lost spellbook. Every step felt like a step into the unknown, but the allure of the magic within the book drove them forward.' This creates a sense of mystery and determination. Then there's 'When the dragon roared, the very ground trembled, and the hero knew that this was the ultimate test of their courage and the magic they had learned.' It builds up the danger. And 'As they finally reached the top of the enchanted mountain, they were greeted by a vision of a city made entirely of crystals, a place where magic and wonder intertwined.' which gives a sense of achievement at the end of a part of the adventure.
Another good opening sentence is 'In the dead of night, a single scream pierced the silence of the small town, but no one could say where it came from.' This creates a sense of mystery as it presents an event that is both disturbing and unexplained. The reader will be eager to find out who screamed and why. It also gives a feeling of a place where secrets might be hidden.
One good opening sentence could be 'The night was as dark as a bottomless pit, and the only sound was the howling wind that seemed to carry a thousand secrets.' This kind of opening immediately sets a spooky and mysterious mood, drawing the reader in and making them curious about what will happen next in the story.