Longs is an amazing place! There is so much to do here. Unfortunately they no longer do overnight camping so your options are to do seasonal, or rent a cabin. Their cabins are very nice. There is so much to do like go karts, swimming, water slides, etc. Be prepared to really go off the grid, as there is no phone service out here at all, and the wifi is terrible.
My family has stayed here too many times to count and we always enjoy it. It can be a bit of a walk to some of the sites if you are at the walk in campground. Be prepared to haul all of your things up to a half mile to the site. This will continue to be our go to campground in the area. The mountain biking trails are not the best, I definitely recommend taking the trip over to Lake Hope for that, as they are among the best mtb trails in the state. If you have Verizon, don’t expect to have any service. AT&T and T Mobile work well, with T Mobile having less dead zones throughout the region.
Park is nice, tent sites along the lake are beautiful and very peaceful. Unfortunately most tent sites are not very level, it can be a bit tough with larger tents. The park is very clean and well maintained and I will definitely be staying here again.