From someone living in the area all the above advice is good. Tunnel mountain is one of the better places if you are in a big unit and want full services at that time of year. Too much like a parking lot for us but you can't get too picky yet.
Weather is very up in the air at this time of year too. We could be like summer as we were this year or there could be campgrounds not even open May long due to them being full of snow especially the early part of May.
Try to go later if you can and there are more options that will be open to you. Early May can still be dicey around here and if all the Farmers Almanac and weather guys are correct we should have a cold a snowy winter so spring may be a little later than the last few.