See the sunrise at Tikal. Flores is particularly popular for its proximity to the ancient Mayan civilization of Tikal. Tikal boasts a wide array of pyramids and other structures, and is easily accessible from Flores by bus. Ask at your hotel or any travel agency around town for a ticket on the earliest bus in order to arrive in time for sunrise. Grab a map at the park entrance and head straight for Temple 5. Climb to the top and relax on the cool stones as the sun rises over the spectacular Guatemalan jungle, and enjoy the view of other pyramids rising above the morning mist. After sunrise, hike around the park, listening to the howler monkeys and climbing around the ruins.
Listen to the music. At the top of the hill upon which Flores is built stands an open courtyard. On pleasant nights, and often on weekends, local musical groups will give concerts in the square. The music is audible from most parts of town, so wander up the hill when the notes drift by on the night air. Take a seat on the many benches and observe the Flores pace of life as the locals make their version of the Italian passegiata. If you speak Spanish, strike up a conversation; Flores residents are friendly and open, and not yet jaded by tourism.
Paddle on the lake. Flores is surrounded by Lake Peten Itza, and there are numerous boats for rent along its shores. If you prefer not to paddle, hire a driver--you'll know them by their cries of "launcha, launcha"--and enjoy a guided tour around the lake. Be sure to agree on a price before you depart.
Eat your way through town. For a small town, Flores boasts an impressive number of restaurants. Work your way through their numbers, and try a different dish at every meal. Guatemalan food is known for its hearty nature, and you'll learn to expect plantains with each order. Flores' one bakery offers a wide array of delicious, cheap baked goods, and a number of small shops sell drinks and snacks.
Wander the streets. Get a workout and make your way around and up the streets of Flores. The city is built on a hill, and you have the option to wind around or head straight up. Walk the shore road and explore small streets, where vendors are willing to show you their wares and shopkeepers will happily converse. Practice your Spanish, and don't worry about safety--Flores is remarkably safe, even for children and solo female travelers.
Hang out in a hammock. Flores' many hotels often boast rooftop terraces with hammocks to spare. Stake out a prime spot, order a drink and watch the spectacular Guatemalan sunsets in peace.