If I had 25 thousand knocking about, I would put at least half into cryptocurrencies with solid fundamentals. A small portion would definately go into BTC, but other interesting projects I like are Monero (completely anonymous), ETH (really great tech), SIA (decentralized storage is just gonna grow) and AMP (new model to monetise content creation/sharing).
Art is always good, as it gives you something to look at.
Make sure to spend some of it on experiences that give you life-long memories!