I visited Gruissan as a teenager in the 90s and was keen to check it out with my girlfreind. I booked the Casino Le Phoebus as it seemed the only decent option available.
The hotel is incredibly easy to find, being just off the main road into Gruissan from the motorway. We arrived at 1pm but our room wasn't ready, we were told we could use the pool or visit the village, we decided to look around the marina which is a 5 minute walk away. The weather was beautiful and despite being late July, everything was very quiet. We came back and while waiting for our room, an extremely polite young lady on reception brought us a complimentary coffee.
The room itself was clean and spacious with excellent air conditioning but was in need of an update. The pool was lovely though and the location was beautiful and serene, and staff were polite and attentive. Gruissan itself comes alive at night, with bars and restaurants reaching all round the harbour, live music and shops and stalls open late. Weather is often windy, but this is most refreshing when its so hot!
Wish I had stayed longer, there is plenty to do in the surrounding area and this is an excellent base to return to and unwind!