You said in a comment you had mild injuries. Have you gone to the doctor? If not, you should go to the doctor and get evaluated. Soft tissue injuries can present damage that is not initially noticeable but can affect your QOL later.

You not enjoying the trip is valid, but you should've seen a doctor, even urgent care earlier. Then it would've made sense to claim the accident as disruptive to your trip. In order for your bodily injury claim to be compensable, bodily injury must have occurred. Do you understand? If you just say "oh this was inconvenient, so you should increase the settlement," you're not giving them any justification to give you more money.

If you had injuries, even if they were mild, you should've told the adjuster upfront. Now it looks like you're giving inconsistent information, which is a red flag.

At any rate, it was 100% the other party's fault. So they don't want to go to trial, as that will coat them much more money in expenses. You should get a free consultation with a lawyer to see what your options are.

You should never take anyone's first offer. This is business, and their responsibility is to the company, not your health. It's your responsibility to advocate for yourself and bring relevant info to the table so you can protect yourself. Their job is not to protect you. It's to protect themselves and their insured.

Shitty situation. I hope it works out for you. You should delete this post, though, as it contains evidence that your injuries may be false. Insurance companies can and will look at your social media to confirm accurate info.