Wow did I miss out on seeing my HV? The last time I saw one was when DS was nearly 3 and DD was about 3 months, she did an assessment for both of them. DD is now nearly 6! DD only had a sight test before she went to school because I rang up to get one cos she was trying to read and DS had like the rest of the family acquired glasses and I was concerned that she may have the same problem so wanted it checked early so she didn't strain her eyes etc. Sorry separate issue!
Lots of local libraries and similar type places offer rhyme time, story time, song time etc, all of which are really good for development!
I have to admit we did a lot of stuff early with DD because she kept asking for it, not clubs and stuff but general learning, she wanted mental stimulation a lot! Yes we taught her to read, after she had taught herself the sounds from Letterland VHS's I got from a charity shop, though not as early as 2 not cos she didn't want to then but because she simply didn't have the concentration to sit still long enough to actually read for herself, only the power to sit and listen to you read a story!
If she likes animals she could learn their names and start to look for differences ie that monkeys aren't the only type of apes, monkeys specifically have tails, or that you can tell the difference between a frog and a toad cos one has smooth skin and the other is warty. That all sounds like learning slog but my DD was obsessed with looking at similarities and differences!
It's to good to go hunting round the garden or local park etc for insects, interesting footprints or collecting different types of leaves in autumn. Learning at the end of the day is as fun as you make it. If you sit them down behind a desk and say here's a text book, a few children will rub their hands together and say goody but most will sigh and switch off. If you make things into a game and an adventure, most will go on that journey as long as you travel on it, you finding things out along the way!