While I wouldn't go the 'workbook route' there are lots of fun things that you could do over the summer that incorporate reading, cutting, maths skills, language etc.
Here is a list of some things we did when my son was a similar age. Don't forget that one of the best things you can do for fine motor skills is to develop good gross motor skills.
Make your own story books
Take photos and turned it into a story board or book
Visit museums, art galleries, zoo, etc.
Do some cooking and get your daughter to read the recipe and do the measuring
Make slime
One time we bought cheap pots and broke them into pieces and then tried to be archeologists and put them back together again
Write a play together
Make up a book of funny jokes
Take a sketch book somewhere and spend some time drawing together
Plant a vegetable garden and keep a growth chart
Buy a cheap weather station and record daily details for the summer
Draw a map of your local area
Design a new park or building
Learn some words in a foreign language
Buy some clay and make your own pots or sculptures.
Sculpt a bust out of styrofoam
Make sock puppets
Make shadow puppets
Visit an observatory
Spend time looking at the night sky
Borrow a bird watching book from the library and do some bird peeping.
Do a big family jigsaw puzzle
Sew some dress up clothes together
Build a cubby house using the furniture and sheets etc.
Read by torch light in the cubby.
Learn to read a street directory and walk around the local area
Build a pin hole camera
Learn to use a microscope
Make an obstacle course in your back yard
Learn the names of dinosaurs
Make a big family tree of your families
Have a tea party and make your own decorations and invitations
Read some poetry on a picnic
And so on.
There are lots of ways to encourage active learning rather than just completing work sheets. In fact there is a lot of research that suggests children learn best when they are on the move and engaged as opposed to sitting still.
Have a fun summer