That sounds like a fantastic family getaway! With your constraints in mind, I’ve crafted a 7-day itinerary that combines relaxation, fun, and a bit of adventure. Given your preferences for an all-inclusive resort with water activities, good food, and a family-friendly atmosphere, I recommend considering a trip to the beautiful Algarve region in Portugal. The weather is typically mild in late August, and there are plenty of upscale resorts that fit your criteria.

Day 1: Arrival in Faro, Algarve

• Morning: Fly from London to Faro. Aim for an early flight to maximize your day.
• Afternoon: Check into your chosen resort (e.g., Pine Cliffs Resort or Martinhal Sagres). Both offer spacious family accommodations with two bedrooms and living areas.
• Evening: Explore the resort and enjoy a welcome dinner at one of the on-site restaurants. Try some local Portuguese cuisine while the kids enjoy the kids' club activities.

Day 2: Resort Day & Water Fun

• Morning: After breakfast, spend the day at the resort’s water park or pool area. The kids can enjoy water slides while you relax with a good book.
• Afternoon: Join a family-friendly activity organized by the resort, such as a treasure hunt or arts and crafts.
• Evening: Dinner at a different restaurant within the resort. Consider a themed night where the kids can dress up!

Day 3: Beach Day & Local Exploration

• Morning: Head to one of the nearby beaches (like Praia da Falésia) for some sun and sand. The beach is family-friendly with shallow waters.
• Afternoon: Enjoy a beach picnic or grab lunch at a beachside café. Afterward, let the kids play in the sand while you soak up the sun.
• Evening: Return to the resort for dinner. If available, book a babysitting service for a romantic dinner for two at a fine dining restaurant.

Day 4: Day Trip to Lagos

• Morning: After breakfast, take a short drive to Lagos (about 30 minutes). Explore the charming old town and visit the beautiful Ponta da Piedade cliffs.
• Afternoon: Have lunch in Lagos, then take a boat tour to see the stunning coastline and maybe even spot some dolphins!
• Evening: Return to the resort for dinner. Share stories about your day with the kids and enjoy some family time.

Day 5: Adventure Day

• Morning: Book a family-friendly adventure, such as a guided kayak tour or a visit to a local water park (like Aquashow Park).
• Afternoon: Enjoy lunch at the water park and let the kids enjoy the rides and slides.
• Evening: Return to the resort for a relaxed dinner. Perhaps enjoy a movie night at the kids' club while you unwind.

Day 6: Leisure & Spa Day

• Morning: Enjoy a leisurely breakfast, then take advantage of the resort’s spa services. Consider a family spa day where kids can enjoy mini treatments.
• Afternoon: Spend the afternoon at the pool or participating in resort activities. The kids can join a cooking class or sports activities.
• Evening: Have a farewell dinner at the resort, perhaps at a restaurant with live music or entertainment.

Day 7: Departure

• Morning: Enjoy a final breakfast at the resort. Take a last stroll around the property or a quick dip in the pool.
• Afternoon: Check out and head to Faro Airport for your flight back to London. Reflect on the wonderful memories made during your trip!

Additional Tips:

• Resort Selection: Look for resorts that offer family suites with two bedrooms and a living area. Pine Cliffs and Martinhal Sagres are excellent choices.
• Weather: Late August in the Algarve typically sees temperatures around 25-28 degrees, perfect for outdoor activities without being too hot.
• Budget: With a budget of £8-15k, you should be well within range for an upscale all-inclusive experience, including flights, accommodation, and activities.

I hope this itinerary helps you plan an unforgettable family holiday! If you have any specific preferences or need more details, feel free to ask! 🌞✈️🏖️