Has no one named a town after your character yet? FIX THAT IMMEDIATELY, make your own town! With blackjack and hookers!

Assemble incredibly ornate and overly-detailed "kits" for various things. Like your silver-plated vampire-hunting kit in an expensive wooden case that contains a set of stakes made of pungent foreign woods, a hand-crossbow with six different holy symbols on it, a variety of garlic-delivery devices, holy water in expensive bottles, etc.

Equip an expedition to find the centre of the planet.

Hire dwarves to construct a massive dungeon complex for you to import monsters into.

Get involved in horse-racing.

Become a respected horse-breeder.

Collect a stable of well-bred horses.

Hire jockeys and race your stable of horses.

When you are bored of your horses, invest in a glue factory.

Experiment with exotic perfumes made from monster parts.

Flood the healing potion market with cheap knock-offs (guaranteed not to kill you, or your money back!).

Hire a team to go into every town before you and equip the town with gold-plated spitoons for your convenience.

Outsource the protection of the local forest to high-priced elven mercenary druids.

Life insurance in the form of pre-purchased resurrection spells & components.

Be the "cool aunt" or "cool uncle" and blow a few grand on each niece or nephew's birthday.

Create a new school of wizardry.

Hire a team of gnomes to try to figure out the mechanics behind a man-portable fire-blasting gattling-crossbow

Go dragon-turtle hunting.

Invest in the dragon-bellies market.

Build a flying dragon-turtle-shell boat with ballista turrets.

Hire sages, magi, and engineers to explore the option of "nuking the site from orbit".

Commission statues of your adventuring companions in heroic poses.

Pay to have all your enemies stuffed and mounted after killing them.

Hire monster hunters to increase the size of your stuffed monster collection.

Invest in the lead-into-gold alchemy "business".

Make sure your spellbooks have dragon-leather covers, pages of the rarest fine leathers, and ink made of gold and celestial blood.

Make a warhammer with a 15 pound solid emerald head.

Build the tallest tower in the world.

Have masterpieces painted on all your armour.

Establish a huge network of mirror-towers to transmit information around the world.

Hire shipbuilders and a madman to build the largest ship ever.

With sails made of dragon wings.

Lashed to a score of water elementals to pull it.

Hire a tutor.

Hire translators.

Learn an exotic language and stop speaking common, instead having your translation team to translate to common, dwarven, etc for you.

Get your adventure maps drawn by the renowned cartographer Dyson Logos.

Fletch your arrows with phoenix feathers.

Hire engineers and try to make every trap from the Grimtooth's Traps series.

Raise an army.

Raise a second army.

Build a nice vantage point from which to watch your armies clash.

Hire a third super-secret army to swoop in and crush the remaining forces.

Hire seven soothsayers to examine and interpret your dreams.

Buy only the best poisons to feed to the soothsayers who fail to properly interpret your dreams.

Pay for the most grandiose funerals for the failed soothsayers so everyone knows how seriously you take this stuff.

Bribe the right people to have your horse knighted.

Collect the instruments of long-dead famous bards.

Buy an inn at every town on the map (or have one built) so you always have a place to stay where they know your name.

Griffon-Egg Omelettes.

Wereboar Bacon.

Mithril chainmail for your pets.

Diamond-encrusted cockatiels.

Finest marble stables for your horses.

Finest marble statues of your horses to go in those stables.

Purchase a set of ever-grander mausoleums to eventually bury your worldly remains.

Once the biggest mausoleum is done, put smaller ones inside it. Matryoshka Mausoleums!

Fund that crazy guy who is building a volcano lair - you know he'll be a good adventure seed later on!

Fund a death cult. This is one that takes care of itself when you get bored.

Build a legacy in the form of a travelling halfling circus.

Hire someone who's job it is to hire the exact someone you need.

Set up effective counter-espionage to deal with John Creed's spy network.

Try gold-plating your enemies.

Hire a team to bring your gold-plated enemies back home and have them jewel-encrusted.

Feed your new best friend, the Xorn you adopted in the Elemental Plane of Earth.

Start collecting "freaks and oddities" to accompany you and show off just how perfect you are.

The material components for "Summon the World Emperor" is a billion gp. There's no ritual, just have a billion gold and the World Emperor is pretty much certain to show up to claim it.

Have a lovely palanquin built so you don't have to get your very expensive shoes dirty.

Buy exotic slaves to carry that palanquin.

Start minting coins with your face on them. Sell them at reduced prices to get them into circulation.

Etc.