Small, fun instruments like the kalimba, harmonica, ukelele.

LEGO, PlayDoh, any kind of building toy, many craft kits could work, electronic toys like Bop-It or Simon can also be fun (you don't need to see to play Simon, since the tones are all different and you can hear which quadrant of the toy they're coming from). Basically any toy/activity that's tactile in nature.

You could also maybe get kid's audio books on CD, or look for movies on DVD that have audio descriptions if the home has the ability to play them.

Auditory things were very great for me as a totally blind child. My favorite was Tickle Me Elmo, BopIt when I was a little older, and audio books on tape. These days you could probably load up a cheap mp3 player or CD with kids audio books. (Chicka-Chicka-Boom-Boom was my favorite book when I was 4) .

Playdough and lego are great as well as someone else already mentioned.

Just imagine: Would this thing be fun for me with my eyes closed?

Large shaped beads and paracord for them to make necklaces/bracelets/key chains. It’s fun for them and it helps their tactile skills.

As mentioned above, Simon or bop-it were big favorites at the blind/low vision a after school program I use to volunteer with.

There’s lots of Braille versions of well known card and board games.

I am totally blind and when I was a kid, I really enjoyed toys that made sounds. I loved Bop-it and Simon in fact, during summer camp, bop-it was so popular that it was almost banned because kids would get into scraps with each other over it. Ah, good times. Anyway, if you get anything that has sound or electronic components like robots, kids will love you.

Squishies work for me (partially blind 18 year old who has severe anxiety) they are soft, and don’t have small parts. You can even smell them. They come with textures on some them (dots of rubber or something, I’ve seen them at Target). I think clay or play doh or slime. Maybe putty? for older kids, maybe musical instruments (like a cheap guitar or a recorder). I’ve been playing cello and guitar for 10 years, you don’t have to be sighted to do it. I also could recommend maybe not LEGO but the larger ones for younger kids. Old keys on a ring (they make a different sound than keys today) tactile Rubik’s cube. There’s toys blind kids can use if you’re looking for them.

Could you take them fruit and sweets as well? This may be something that the place cannot purchase easily because of how funds are spent. For example, in the program I work in, I can buy toys for children, but I cannot buy candy for them.

Depending on the age, something soft like a teddy bear or other plushies.

There is a tactile Rubik's cube now too.

let’s keep in mind there are bound to be some kids with multiple disabilities as well as visual impairment, so whatever you get should be simple, no small parts, easy to manipulate with hands, and also if you do choose food maybe check for food allergies first? the kids i work with (ages 4-8) all have multiple disabilities and so many can’t have specific foods or can’t have solid foods, so bringing candy can often leave them feeling excluded. however, they just adore music toys, not necessarily instruments but toys that make sounds or music when you press simple buttons or turn knobs. if any of the kids have autism/other issues that make them sensitive to sensory input and visual impairment, anything that makes repetitive, unique sounds is really great. one kid LOVES keys and bolts, will just sit and hold a ring of keys to his ear and listen for as long as possible. basically the point is sound/music is great!! also other sensory toys like slime, play-do, kinetic sand, or clay are great too. best of luck!

What ages and which country?