In Lagos (Portugal), here are some top things to do:

• Take a boat cruise to Ponte da Piedade to see dramatic cliffs, grottos, and sea arches. This is the number one must-do activity in Lagos.
• Explore Lagos Old Town with its charming white-washed buildings, cobbled streets, and highlights like the seafood market, Igreja de Santo António church, and old architecture such as Porta de São Gonçalo and Forte da Ponta da Bandeira.
• Visit museums like Museu de Lagos and the Mercado de Escravos which covers the history of slavery in Lagos.
• Enjoy the beautiful beaches like Praia da Batata, Praia Dona Ana, and Praia do Camilo.
• Go kayaking along the coastline and sea caves.
• Stroll along the Lagos Marina and waterfront promenade.
• Experience local culture at places like Terra Kulture for arts and stage plays, Nike Art Gallery for Nigerian and African art, and Jazz Hole bookstore with occasional concerts.
• Visit recreational and fitness centers like Upbeat in Lekki for sports and team-building activities.

Lagos offers a blend of natural beauty, cultural experience, historic sites, and outdoor activities suitable for all interests. Boat tours, beach relaxation, historic exploration, and art/culture venues are the main highlights to include in a visit. This summary is based on multiple travel sources and guides on Lagos, Portugal.