When it comes to budget-friendly but fun seaside spots, here are some suggestions:

1. Azores: This Portuguese island group is located in the Atlantic Ocean. It has spectacular beaches, volcanic landscapes and abundant marine life. Transportation and accommodation here are relatively cheap and suitable for budget travelers.

2. Da Nang: Located in central China, Da Nang has beautiful beaches, spectacular mountains and unique cultural landscapes. Food and accommodation here are relatively affordable, making it a popular budget travel destination.

3. Boracay: Boracay is one of the most popular beach resorts in the Philippines, with white sandy beaches, clear waters and abundant water activities. While there are some upscale resorts, you can also find some affordable accommodation options.

4. Krabi, Thailand: Krabi is located in southern Thailand and has spectacular islands, beaches and coral reefs. There are plenty of affordable accommodations and local delicacies for budget travelers.

5. Bali: Bali is one of the most popular tourist destinations, with beautiful beaches, temples and unique culture. While there are some upscale resorts, you can also find some affordable accommodation and local restaurants.

These places offer beautiful beaches and rich natural landscapes, as well as some affordable accommodation and dining options. Remember to plan your budget and make arrangements in advance to ensure your trip is enjoyable and affordable.