A good large frame bike, lightweight is nice. I've had several very interesting bikes to ride. One had a cam system on the crank such that the down stroke on the pedals had a different effect than the up. Another was just a very nice but lightweight comfortable seat mountainish bike.Friends left them with me for awhile and asked me to ride them to keep them from rusting up. I need a bike with a lot of gears because we do have hills here on the island.

An electric car like the cute ones rented to tourists in San Francisco. I could use this in good weather for 90% of my travel and I have a couple of very nice big solar panels I could use to do some of the charging.

Or an electric motor assist kit for my Rhoades Car. That's a 4 wheeled bicycle I have. Unfortunately I think the ahem un-ergonomic unevolved positioning of the recumbent seats makes it far less efficient to pedal than a bicycle. Both passenger and driver can pedal and it has 36 gears but - it is not practical around here w/o power assist. Again I have the solar panels I could use to charge it if I had any workable motorizing kit.

A secondary disc brake for the Rhoades Car. Already has the primary one.

UPDATE: I have a 2001 Volvo V70 now so we have seatbelts and heat. Gas mileage not so good :) - avg 22 mpg. We don't go far now.

A newer, safer automobile than I have (1991 Dodge Colt)  - ie one where the seat belts will definitely work in a crash. Either gas or hybrid but I'd need something with decent gas mileage. I used to have a wonderful Honda with a moonroof, A/C and power everything - but we got T-boned by a pickup truck on the passenger side. Luckily my son was unharmed due to the good construction of the doors and side reinforcements of the Honda Prelude.

Wild request - Segway - for the geek fascination factor.