Make restaurant reservations ahead of time and prepare or buy food to bring to the beach.
To get to the beach at Praia da Bordeira you will have to walk about 10-15 minutes, depending on where you park. There didn’t appear to be a stroller path and you might have to wade through a stream. We carried our youngest in a backpack carrier. The older kids loved playing along the stream. Careful though, the sand can get hot.
Get an early start in the morning so you have lots of time to enjoy the beaches. Plan to stay all day and enjoy a beautiful Portuguese sunset to finish out the day.
We found the Algarve to have nice weather and few crowds during April (despite it being Spring Break). It can get quite hot later in the summer.