NOTE: Bring small change. It costs $25 to enter and there isn't a station with a ranger to pay with credit card, so bring smaller denominations.
The road was gravel most of the way, watch out for potholes. The potholes aren't as bad as other roads leading up to trailheads (Phelps Creek), but we went up in a sedan and it was doable. And hey, if a Prius can make it, everyone can make it! It was a hot day and it hadn't rained in a while, so there was a TON of dust that kicked up as cars past.
We arrived around 1:30 PM on a hot and clear Saturday and there were cars parked along the side of the road for at least a mile down. It's a very popular hike area amongst folks. We had planned to camp overnight at the Mowich Lake campgrounds, but all 10 spots were already spoken for. We ended up camping at Evans Creek Campground.
We started the hike at Mowich Lake. The hike was pleasant and tree covered most of the way. There are a ton of insects this time of year, so be prepared. The trek up to Eunice lake was enjoyable, nothing too difficult, but with a few switchbacks. From the lake it was a climb up to Tommie Peak Lookout, but we were distracted by the grandeur of Mount Rainier and Eunice Lake. Upon ascending to the lookout you can continue along the ridge, but beware there's no tree covering, so if you are hiking on a hot day, be prepared.
We stopped and had lunch at the lookout before heading back down. The views were absolutely jaw dropping and made the climb and dealing with the crowds worth it. The mountain was perfectly visible in the sunny day and our pictures could have passed for postcards.
Overall, it was a highly enjoyable hike with grandiose views, my only recommendation would be to go on a weekday if possible.