Redwood (Kinda soft) or Mahogany ( a bit pricey but you don't need that much) would be good candidates. You could do the seats and bumps for $100 bucks or less. White oak would be good to. Heck you could even use Southern Yellow Pine. They all are used in the wooden boat industry.
Yep Doug Fir is good too! Lot's of resin. If you apply some Boiled Linseed oil mixed with 50% Mineral Spirits to the wood to it 2-3 coats. let it dry for a day then stain it with oil based stain again thin the first coat 50% and then two coats full strength. and then 2-3 coats of Marine Varnish she'll shine like a New Penney!!!! When I was a young man I worked at a Marina and did a lot of wood restoring on the older boats that had Mahogany seats and rails like that. The old codger I worked for taught me a lot about sealing the wood and making it shine. The BLO has a lot of solids in it and really seals the pores of the wood but still allows the stain to penetrate.
Congrats on the new toy. It's shiny! Good to have another AT owner around to. I was gonna suggest oak trim too, simply because it bends easily and is fairly inexpensive, but teak would be nice. Here's a bit of info on AT's to hold you over (looks like you may have a '55ish).