If you're looking for anime similar to Lupin III Special 7: The Pursuit of Harimao's Treasure, you might like these titles. All recommendations are made by Anime-Planet users like you!
Rumors tell of a magnificent treasure buried at the bottom of the sea near Koumi Island - the very place that Conan, Mori, Sonoko and the rest of the gang have just arrived at to take a vacation. The treasure supposedly has something to do with Anne Bonnie and Mary Reed - two female pirates who lived hundreds of years ago. Conan and his friends soon find themselves in the middle of a grand adventure involving deep sea diving, planned shark attacks, kidnappings, and the most important element of all: the famed pirate treasure itself!
Both Detective Conan: Jolly Roger in the Deep Azure and Lupin III: The Pursuit of Harimao's Treasure are feature length anime focusing on the hunt for treasures hidden away by infamous characters. While approaching the hunt from different perspectives, one from the criminal and one from the detective, both have a spattering of action, so if you liked one, it's worth trying the other.