This is what I'd do. I'm in FDC so my response may be diff to centre based care
"im going to the beach on saturday"
"Are you? Who are you going with?"
"Do you know where the beach is and what you might see there?"
I'd be inclined to change the question
"how was the beach on saturday ??"
to
"I remember the other day you mentioned you were going to the beach?"
"Did you go?"
"What did you see/do?"
respond to the child's answers.
I'd have some sea shells in the sandpit/sad tray, shovels, buckets. Sea animals in the water tray/table.(LOC 4.4: Children are confident and involved learners
Children resource their own learning through connecting with people, place
technologies and natural and processed materials)
Maybe some beach towels and empty sunscreen bottles.
(This could lead you into (LOC 3.2 Children have a strong sense of wellbeing.
Children take increasing responsibility for their own health and physical wellbeing)
If you have the facilities help the child (If it is age appropriate) to look up the things that were seen heard on the internet.)
Just a few ideas
Hope this helps