Malta in June HELP please

We never made it to St. Julian’s or Sliema, but instead spent most of our time in and around Valletta, which has something for everyone. Valetta is very walkable, although there are a lot of hills - big ones - think Lisbon or Porto.

Don’t leave town without seeing the Lascaris War Rooms and the Malta at War Musuem in Birgu. (Take the ferry across.) Malta took the most intense bombing of WWII and the Rooms and Museum offer an excellent overview of life during that time, Malta's role in the invasion of Sicily and related topics. We needed 2+ hours for the Museum and 1.5+ for the rooms. There's a lot to digest. The War HQ Tunnels offers a one-hour tour and a lot of info about the war and up to the Cold War. Other must -sees are definitely St. Johns Co-Cathedral and Museum to see the Carvaggio. Check the co-cathedral hours, though as they change without a lot of notice. The Knights of St. John figure hugely in Malta’s history, so read up before you go. The Barrakka Gardens are a nice place to grab a drink and see some beautiful views of the harbor. The National Museum of Archeology is worth an hour or two, especially if you are interested in the prehistoric archeological sites like the Hal Safieni Hypogeum and Tarxien Temples. Book the Hypogeum asap if you want to go. Limited admissions and high popularity means it books weeks, if not months in advance. The Tarxien Temples are only a 10 minute walk from the Hypogeum. Unlike the Hypogeum, the entire site is above ground. No reservations necessary.

We spent time strolling around Birgu, Vittoriosa and Floriana. You’ll notice the colorful gallarija, or enclosed wooden balconies everywhere. If you like orchestral music, check the Manoel Theatre. It’s open for tours daily. The Grand Master's Palace was closed for renovation when we visited, but it's a popular site. We also enjoyed Mdina, but I would suggest that you go late afternoon/early evening to miss the day trippers. We visited during the day and liked it so much we came back at dusk to enjoy the silence of the city and the golden glow of the dimly lit sandstone buildings. Marsaxlokk is a small fishing village about 30 minutes from Valetta. Colorful boats bob in the harbor and we had an excellent seafood lunch at the waterfront. Try the fish baked in a salt crust. Tasty, and you get the dramatic serving-of-the-fish routine from the entertaining waiters. Both Mdina and Marsaxlokk are easy to get to. While busses are cheap, they are also crowded and unreliable. We gave up on it very quickly. Our Airbnb host suggested E-cabs and Cool, which are Uber-like services that are cheap and very efficient.
We spent one long day on Gozo, which, with the help of a Tours-by-Locals guide, was enough for us. There are a few historic sites, including the cart tracks and Victoria. The fast ferry is the best way to get there.
The food in Valletta was great. Definitely try the pasta carbonara at Zero Sei Trattoria Romana, and the same family owns a pizzeria to-die-for, Sotto. Book ahead or eat very early. Other worthy stops on the dining circuit were Caffe Cordina, Nenu the Artisan Baker for rabbit (fenek) and ftira, the traditional pizza-like creation with olives, capers, cheeses, and meats. (We skipped the horsemeat) Another good Italian trattoria was Adesso. Piadina, filled with cheese, mushy peas or more esoteric choices with prosciutto, rocket and cheese are delicious hand pies that are your only choice for a quick meal, as well as being delicious. We found that the concept of a "quick bite" in restaurants was not one that was widely acknowledged, and it did mess up our timing a bit.
A Tours-by-locals guide helped us cover the more far-flung sites of Malta. Not cheap, but efficient and worth the time and money just for the expertise of the guide and his insights into the society's politics, education, women's issues, and healthcare. The Bradt guide and Lonely Planet guide helped with planning.

The above is reply is good. You can also try google. It is a site that has a lot of will help you figure out your trip.