I absolutely loved being at home all summer with mine. It's such a privilege.
He needs to learn to have a structure and a plan. Even just walk to the shop to get a lolly and sit in the park.
Every day a little something.
It sounds like he's out of practice.
Stuff 3 and 5 years can do with minimal instruction......
Play under a sprinkler, lazy daisy is a fun one as it's less predictable, no water collects as it's not a pool.
Two chairs and a blanket with pegs make a den, it's more fun in the garden.
Jumbo chalks on the patio or the side of the house, can be hosed off.
Longest pasta threading..... a bag of penne pasta and a ball of string.
Old cartons, rice and cling film make shakers. Outside is best as it's messy.
Trip to the library to choose a book. Never too early to start this. Lots of libraries do a session for smaller children.
We did feeding the birds, feeding the fish, spotting birds & butterflies and identifying them.
Pooh sticks
For the two year old, a roll of cheap lining paper over the kitchen table and brushes with just (food dye) coloured water is an easy play activity.
I had a trailer bike to fit two so I could take mine out cycling.
We have an animal park very close to us and I'd factor in a season pass so we could go up to see the animals once or twice a week. It helps because they can play with other children.
I think it's easy to feel out of your depth when it gets overwhelming. Especially if it's out of normal routine.
I found the secret was to always have something planned. It doesn't need to be costly.