Let the harbour set the pace
Selce is at its most rewarding in the spaces between activities: watching small boats, taking a coffee by the water and choosing a place to swim after a stroll. The old village and the waterfront are better explored slowly than reduced to a quick photograph.
For swimming, look at the individual beach rather than assuming one surface across the whole village. Pebble, paved and other bathing areas offer different entry conditions; footwear can make a real difference.
Plan for your own version of easy
Families benefit from checking shade, toilets and the walking distance from their accommodation. Visitors with reduced mobility should ask about the complete route, not only whether a property or beach is described as accessible.
Outside summer, Selce still offers a waterfront escape, but services and restaurant opening days are not uniform. Build a short break around walks and meals you have confirmed directly.
Sources & useful links
Facilities, prices, opening hours and transport schedules can change. Check the linked official source before you travel.